Glossary of Sex Terms

69: a sexual position in which both partners perform oral sex on the other at the same time.

abortifacient: any method or substance used to terminate a pregnancy.

abortion: the termination of a pregnancy before birth.

abstinence: not participating in sexual activities.

acquaintance rape: a forced sexual encounter between individuals who know each other.

acquired dysfunction: a problem with sexual functioning that begins after a period of normal functioning.

Acquired Immune Deficiency Syndrome (AIDS): an illness which is caused by a virus transmitted from an infected person to another via blood, semen, vaginal secretions, and sometimes breast milk. The illness is characterized by the destruction of the immune system leaving the person susceptible to many other common infections.

acrosome: an enzyme membrane that covers the head of the sperm allowing it to penetrate the ovum.

activating effects: the effect that sex hormones have on the level of a persons sex drive.

adhesion: when the foreskin gets stuck on the head of the penis. Adhesions make it painful for the foreskin to be pulled back from the penis. These are easily preventable and treatable.

adolescence: the transitional period from childhood to adulthood where emotional, social and physical changes take place.

adultery: a sexual encounter which occurs between a married person and someone whom is not their spouse.

agender: individuals who express their gender as something other than man, woman, or any other gender.

agenesis: of the penis a condition in which the penis in undersized and nonfunctional.

ally: a person who supports the rights of a group they are not a part of, such as the LGBTQ group.

alveolar glands: glands in a woman's breast which produce milk after she has given birth.

amenorrhea: the absence of menstruation.

ampulla: the wide section of the fallopian tube near the ovary.

anal intercourse: sexual intercourse in which one partner penetrates the other's anus.

analingus: oral-anal stimulation.

anaphrodisiac: drugs or other agents that dull sexual desire.

Androgen: - insensitivity syndrome a developmental condition in which a genetically male fetus develops external female genitals.

Androgenital syndrome: a developmental condition in which a genetically female fetus has internal female structures in addition to external male genitals.

Androgens: male sex hormones.

androgynous: having both masculine and feminine characteristics.

anejaculation: lack of ejaculation at the time of male orgasm.

anodyspareunia: pain associated with anal intercourse.

anarchism: a rare birth defect in which both testes are not present.

anorgasmic: never having reached an orgasm.

anovulatory: not ovulating.

antiandrogen: a substance that decreases the levels of androgens in the bloodstream.

anus: the opening from the rectum from which solid waste leaves the body.

aphrodisiac: any substance that increases sexual desire.

areola: the dark areas surrounding the nipples on men and women.

arousal: physical changes that occur in the body that lead to sexual excitment.

artificial insemination: the introduction of sperm into the reproductive tract by means other than intercourse

asexual: having little or no interest in sex.

asphyxophilia: a paraphilia in which sexual arousal is dependent on being strangled up to the point of passing out.

autoerotic: providing sexual stimulation for one's self.

autofellatio: a male providing oral stimulation to his own penis.

Bacterial Vaginosis: the most common form of vaginal infection in menstruating women, characterized by a strong odor and a grey or milky discarge.

balanitis: an inflammation of the glans and foreskin of the penis that can be caused by infections.

barrier: methods of birth control contraceptives that block sperm from entering the uterus, such as a condom.

Bartholin's glands: glands just inside of the vaginal opening the secrete a small amount of fluid during arousal.

basal body temperature method: a method used to predict fertility in which women chart ovulation by taking their rectual temperature every morning before getting out of bed.

Benign Prostatic Hyperplasia (BPH): enlargement of the prostate gland not caused by a malignancy.

bestiality: a human being having a sexual encounter with an animal.

bicurious: a person who is generally attracted to only people of the opposite sex, but is curious about attraction to the same sex.

bigender: an individual whose gender identity encompasses both male and female. Sometimes one side can be stronger than the other, but they are both present.

bilateral orchiectomy: surgical removal of both testes.

bimanual exam: a medical exam which checks for abnormalities in the ovaries and uterus.

birth control: refers to the many ways of avoiding conception while remaining sexually active.

bisexual: a person who is attracted to people of both genders.

blow job: a term referring to oral sex on a male.

blue balls: genital aching which may occur in males following continued genital stimulation without ejaculation. A woman may also feel aching without orgasm.

bondage and discipline (B and D): sexual behavior or role play which has elements of sadism or masochism.

boner: a slang term used for "erection". Occurs when a penis fills with blood and becomes hard, usually in terms of sexual excitement.

breasts: two glands on the chest of women.

breast exam: an examination that can be done by oneself, or a health care provider. Utilized in checking breasts for symptoms such as discharge, unusual lumps/swelling, and pain..

brothel: a house of prostitution.

bulbocavernosus muscle: the muscle at the base of the penis that contracts to force the ejaculate through.

Bulbourethral gland (Cowper's gland): glands located below the prostate that produces the fluid which makes semen sticky.

calendar method: a method used for predicting fertility in which women chart their menstrual cycles on a calendar.

Candidiasis: a vaginal yeast infection which results in vulval irritation, and a thick white discharge.

celibacy: the state of voluntarily being unmarried, sexually abstinent, or both, usually for religious reasons.

cervical cap: a method of contraception which is usually filled with contraceptive jelly and inserted to fit securely on the cervix.

cervicitis: inflammation of the cervix

cervix: the structure that connects the vagina to the uterus.

chancroid: a type of STI which cause ulcers in the genital region.

cherry: a slang term for hymen.

Chlamydia: the most common STI which causes a discharge in both men and women, if left untreated it could cause sterility.

cilia: hairlike extensions in the fallopian tubes that help move the ovum through.

circumcision: a surgical procedure in which the foreskin of the penis is removed.

cisgender: a term used by some to describe people who are not transgender.

climax: an orgasm

clitoral hood: tissue that is formed by the joining of the labia minora and covers the clitoris.

clitorectomy: surgical removal of the clitoris.

clitoris: the sexually sensitive organ of the female found in the vulva.

coitus: another term for sexual intercourse.

coitus interruptus: a method of birth control in which the male withdraws his penis from the vagina before ejaculating.

colposcope: a medical instrument that is used to examine the vagina and cervix.

combined oral contraceptiv: e birth control pill that contains both estrogen and progestin preventing ovulation.

coming out: a figure of speech for lesbian, gay, bisexual, pansexual, transgender, and asexual (LGBT+) people's self-disclosure of their sexual orientation (or lack thereof) and/or gender identity.

comprehensive sexual education: a form of sexual education in which all options are spelled out (abstinence as well as contraception), and pleasure in sexuality is emphasized..

conception: when the egg is fertilized by the sperm.

condom: a over-the-counter method of birth control usually made of latex that covers the penis during intercourse preventing not only pregnancy but the spread of STIs.

consensual sex: when all parties involved understand and agree to a sexual encounter, no one is being forced or coerced to perform or receive.

contraception: any method that is used in the prevention of pregnancy.

contraceptive sponge: a barrier method of birth control which is inserted and placed over the cervix.

coprophilia: sexual arousal that is connected with feces.

coronal ridge: located in the penis it is the rim of the glans.

corpora cavernosa: tissue that engorges with blood during sexual arousal to make the penis become erect.

crabs: a slang term for "pubic lice", an STD characterized by a parasite living and laying eggs within pubic hair.

Cremaster muscle: an automatic response which raises and lowers the testes in response to stimulation.

cross-dresser: While anyone may wear clothes associated with a different sex, the term cross-dresser is typically used to refer to heterosexual men who occasionally wear clothes, makeup, and accessories culturally associated with women.

cryptorchidism: a medical condition in which one or both of the testes do not descend from the body before puberty.

cunnilingus: oral stimulation of the female genitals.

cybersex: a sexual interaction that takes place over the internet.

date rape: similar to the term "acquaintance rape", when a person is raped by someone they know.

dead name: what some transgender individuals refer to as the name they were given at birth.

delayed ejaculation: another term for inhibited orgasm occurring in men.

dental dam: a piece of latex used to cover the female genitals during oral sex to prevent the spread of infection.

Depo-Provera: an injectable form of birth control which lasts in preventing pregnancy up to three months.

desire: a feeling of sexual attraction or arousal.

diaphragm: a method of birth control that is placed over the cervix to prevent pregnancy.

dildo: a penis shaped sex toy.

Dominance and Submission (D and S): erotic fantasies that play out power and powerlessness.

douche: a rinse used to clean the vagina.

drag queen: men, typically gay men, who dress like women for the purpose of entertainment.

dysmenorrhea: a term used to describe painful menstruation.

dyspareunia: a dysfunction in which recurrent pain occurs during sexual intercourse.

egg cell: the ovum or female reproductive cell.

ejaculation: the release of the semen from the penis caused by muscular contractions.

ejaculatory inevitability: the feeling that ejaculation is imminent.

ELISA: the most common used test to determine the presence of HIV infections in humans.

embryo: the prenatal organism that develops about a week after fertilization.

emergency contraception: the use of contraceptives to prevent pregnancy after unprotected intercourse.

emission stage: the first stage of ejaculation in which seminal fluid collects in the urethral bulb.

endometriosis: a medical condition in which the endometrium grows out of the uterus and into surrounding organs, characterized my menstrual pain and may cause infertility.

endometrium: the lining of the uterus that develops every month to nourish a fertilized egg, if fertilization does not occur it is shed during the menstrual cycle.

epididymis: the place in each testes where sperm cells mature.

erectile dysfunction: the inability to become erect or maintain an erection.

erection: a physiological phenomenon in which the penis becomes firmer, engorged and enlarged.

erogenous zone: any part of the body that is responsive to sexual stimulation.

erotic: that which is sexually arousing.

erotica: sexually explicit material that is not viewed as pornography or obsence by the average person.

estrogen: hormone that is produced by the ovaries and regulates the menstrual cycle and secondary sexual characteristics.

exhibitionist: women or men that expose their sexual organs to others without their consent.

exocytosis: the release of genetic material by the sperm cell which begins the process of fertilization.

fallopian tubes: structures which the ovum travel through to get from the ovaries to the utrerus.

family planning clinic: a clinic that specializes in sexual and reproductive health care.

fantasy: a sexually arousing thought or mental imagery.

fellatio: oral stimulation of the penis.

female condom: a method of birth control that is inserted into the vagina which prevents pregnancy and the spread of infections.

female genital mutilation (FGM): the removal of all or part of the external genitalia

female orgasmic disorder: a persistent problem in which women can not reach orgasm through sexual stimulation.

female sexual arousal disorder: a sexual dysfunction in which the female can not become sexually aroused, lacking vaginal lubrication.

feminine: characteristics that are culturally associated with being a woman.

fertilization: the joining of egg and sperm.

fetishism: sexual arousal triggered by things that are not usually considered sexual.

fetus: the organism that develops from the embryo inside the womb until birth.

fibrillations: abnormal contractions which are painless which occur during arousal and orgasm.

fidelity: observances of sexual faithfulness.

flaccid: referring to when a penis is not erect.

follicle-stimulating hormone (FSH): a hormone that is released by the pituitary gland during the menstrual cycle and stimulates the growth of ovarian follicles.

foreplay: sexual stimulation, such as kissing, that occurs before intercourse but can still lead to orgasm.

foreskin: the fold of skin covering the glans of the penis.

fornication: sexual intercourse occurring between partners who are not married.

frenulum: highly sensitive fold of skin on the underside of the penile glans.

frotteurism: a paraphilia in which one rubs their genitals against a nonconsenting person.

gamete: the reproductive cell, either male or female.

gay: another term for homosexual, usually referring to a man.

gender: the range of characteristics pertaining to, and differentiating between, masculinity and femininity; the traits and behavior that are culturally assigned with either.

gender dysphoria: conflicting feelings about physical anatomy and one's feelings about their gender.

gender expression: one's internal, deeply held sense of one's gender.

gender identity: one's view of him/herself; most people have a gender identity of man or woman (or boy or girl).

gender non-conforming: a term used to describe some people whose gender expression is different from conventional expectations of masculinity and femininity.

gender questioning: an individual who is exploring, questioning, or processing how they want to express their gender identity.

genderqueer: a term used by some people who experience their gender identity and/or gender expression as falling outside the categories of man and woman.

gender roles: behaviors or characteristics that are culturally expected of an individual.

gender stereotyping: assuming that someone should display certain characteristics because of their physical sex.

genital herpes: a sexually transmitted infection caused by the herpes simplex virus in which painful blisters and ulcers are present on the genitals.

genitals: external body parts, typically male or female.

genital warts: a sexually transmitted infection caused by the human papillomavirus in which warts appear on the genitals and anus.

glans: the soft highly sensitive tip of the clitoris or penis.

gonads: sex and reproductive glands, in men the testes, in women the ovaries that produce hormones.

gonorrhea: a sexually transmitted infection caused by the Neisseria gonorrhoeae bacterium in which abnormal discharge occurs in both men and women.

Grafenberg spot (G spot): an area inside the vagina that many people believe is very sensitive to stimulation and cause ejaculation in women.

gynecology: sexual and reproductive health care for women.

gynecomastia: a rare condition were the male's breasts are overdeveloped.

hard-core pornography: pornography that is very explicit.

hate crime: a crime committed against someone solely based on a group they are a part of like race, religion, sexual orientation, etc..

hepatitis B virus (HBV): a liver disease cause by a sexually transmitted infection that may result in death.

herpes simplex virus type 1 (HSV-1): the virus that cause blisters on the lips and mouth.

herpes simplex virus type 2 (HSV-2): the virus that causes genital blisters.

heteroflexibility: a person who is usually in a heterosexual relationship, but is open to the potential for a same-sex relationship.

heteronormative: tan assumption or perception that everyone is heterosexual.

heterosexual: someone who is sexually attracted to people of the opposite sex.

homophobia: fear and hatred of people who are gay, lesbian, or bisexual.

homosexual: someone who is attracted to people of the same sex.

hormone: a substance secreted by the endocrine gland that regulates many different bodily functions.

hormone replacement therapy: replacement of naturally occurring hormones by synthetic ones, usually during menopause.

human immunodeficiency virus (HIV): the virus that causes AIDS, by destroying the body's immune system and leaving it susceptible to infection.

human Papillomavirus (HPV): the virus that causes genital warts.

human sexuality: the ways in which we experience and express ourselves as sexual beings.

hydrocele: a medical condition in which cysts form on the testes.

hymen: a thin tissue of flesh which stretches across part of the opening of the vagina.

hyperphilia: have sex more often than most people.

hypoactive sexual desire disorder: a condition where one losses interest in what was formerly sexually arousing.

hypoxphilia: a practice where one creates pressure around the neck to create an intake of less oxygen to enhance sexual pleasure.

hysterectomy: surgical removal of all or part of the uterus.

Implanon: a long-acting reversible contraception that is inserted just under the skin of a woman's upper arm and contains etonogestrel.

impotence: difficulty getting and keeping an erection.

incest: sexual activity between members of the same family.

infertility: the inability to conceive a child.

infibulation: a surgical procedure which is used in some cultures to close the opening of the vagina until marriage.

intercourse: sexual activity where insertion of the penis occurs.

intersex: a variation in sex characteristics including chromosomes, gonads, or genitals that do not allow an individual to be distinctly identified as male or female.

intersexuality: a rare condition in which the genitalia is unclear at birth making it hard to determine whether the child is male or female.

intimacy: the emotional feelings of closeness and connectedness between people.

intrauterine devices (IUD): a method of birth control in which a small plastic object (e.g. Mirena, Copper 7, Skyla) is placed inside the uterus by a medical provider to prevent implantation.

IVF: In vitro fertilization is a process by which an egg is fertilized by sperm outside the body: in vitro ("in glass").

jock itch: a fungal infection around the genitals of men caused by wearing tight clothing or excessive sweating, it can be itchy and very painful.

jaundice: a medical condition where the whites of the eyes and the skin becomes yellow in color.

Kegel exercises: exercises which are used to strengthen the pubococcygeus muscle which controls the flow of urine and may increase sexual pleasure.

kinky: being attracted to what others might perceive as less common practices of sexual behaviors.

kleptophilia: a paraphilia in which sexual arousal becomes dependent on stealing.

Klinefelter's syndrome: an abnormality occurring in males where musculinization is incomplete and partial breast may be present as a result of an extra X chromosome.

klismaphilia: a paraphilia in which sexual arousal depends on giving and/or receiving enemas.

labia majora: two folds of tissue that extend and cover the clitoris, vaginal opening, the labia minora and the urinary opening.

labia minora: two folds of skin lying underneath the labia majora that join directly above the clitoris.

lesbian: a homosexual female; a female who experiences romantic love or sexual attraction to other females.

leukorrhea: a white, sticky vaginal discharge that is normal during adolescence.

levonorgestrel: a hormone which is produced to help regulate the menstrual cycle.

libido: a term used to describe sexual drive

love: a strong caring for someone else.

lubricant: a substance that is used to reduce discomfort of chafing or irritation during sexual activities.

lumpectomy: the surgical removal of a lump from the breast.

lust: the desire for sexual pleasure

luteinizing hormone (LH): a hormone released by the pituitary gland that controls ovulation.

male erectile disorder: difficulty achieving or maintaining an erection.

male orgasmic disorder: a condition in men in which there is a delayed or inability to reach orgasm.

mammogram: a type of x-ray which is used to determine lumps in the breast.

masculinity: characteristics that a culture attributes to men.

masochism: a paraphilia in which sexual arousal is dependent on receiving punishment or pain.

mastectomy: surgical removal of all or part of the breast tissue.

masturbation: self-pleasuring.

ménage a trois: sexual play involving three people.

menarche: a girl's first menstruation.

menopause: the time when a woman stops her menstrual cycle.

menstruation: the monthly flow of blood and tissue from the uterus which occurs if fertilization does not occur.

miscarriage: a spontaneous abortion.

misgender: addressing someone using the incorrect words and pronouns for the gender with which they identify.

missionary position: the coital position in which the man is on top of the woman.

monogamy: referring to being committed to only one sexual partner at a time.

mons pubis: the tissue that covers a female's pelvic bone.

"morning after" pill: another term for emergency contraception.

multiple orgasms: the ability to achieve additional orgasms in one sexual episode.

mutual masturbation: the practice of partners touching their own genitals, or each other's genitals, at the same time to reach sexual pleasure.

natural family planning: a method of birth control which depends on keeping track of a women's menstrual cycle and the days on which she is likely to be ovulating.

necrophilia: participating in sexual activity with a dead body.

nipple: the raised area in the middle of the areola in the center of each breast.

nocturnal emission: an ejaculation which occurs during sleep that often signals the onset of physical maturation.

non-binary: a term used by those who experience their gender as outside the categories of female or male. They may feel their gender falls somewhere between the two categories, or something completely different. See "genderqueer".

obsenity: sexual activity in a manner which most people would refer to as disgusting.

opportunistic infection: any illness that is relatively easily cured in people with a healthy immune system but often threatens those with AIDS.

oral contraceptive: a method of birth control in which pills containing different levels of hormones are taken daily.

oral sex: any type of sexual activity involving the mouth and the sex organs.

orgasm: a pleasurable sensation that occurs at the climax of sexual excitement.

orgy: a group of people engaging in sexual activity.

outercourse: a type of sexual play that does not include penetration.

ovaries: the female gonads, which produce hormones and house the egg cells.

ovulation: the release of an ovum from the ovaries, approximately every month.

ovum: an egg cell.

pansexual: not limited in sexual choice with regard to biological sex, gender, or gender identity

pap test: a medical test in which cervical cells are taken by a swab to see if there are any abnormalities.

paraphilia: the experience of intense sexual arousal to atypical objects, situations, or individuals.

pediculosis: an infection from pubic lice.

pedophilia: a paraphilia involving children or young adults.

pelvic exam: the examination of the outer and inner genitals of a female by a medical professional.

pelvic inflammatory disease (PID): inflammation of the cervix, uterus, fallopian tubes and ovaries in which pain, tenderness, fever, nausea and irregular menstrual cycles are present.

penile plethysmograph: an instrument which measures arousal in men by measuring blood flow to the penis.

penis: the male sex organ.

performance anxiety: feelings of fear associated with sexual activity.

perineum: the tissues which lies between the vagina and the anus.

Peyronie's disease: a medical condition in which tissue is developed in the erectile columns of the penis.

phimosis: an abnormally long and tight foreskin on the penis.

pimp: a man who has female prostitutes working for him.

pneumocystis carinni: pneumonia the most common opportunistic infection in AIDS patients, characterized by shortness of breath, chest pain, fever and fatigue.

polycystic ovary disease: a medical condition in which overproduction of male hormones causes cysts on the ovaries and swelling.

polygamy: being married to more than one spouse.

polythelia: a rare condition in which one has more than two nipples or breasts.

pornography: the portrayal of sexual subject matter (e.g., written or visual) for the purpose of sexual arousal

postcoital contraception: another name for emergency contraception.

pre-ejaculate: the liquid which leaves the penis during sexual arousal but before ejaculation, it may contain small amount of sperm.

premature ejaculation: a persistent sexual dysfunction in which ejaculation occurs after minimal stimulation.

premenstrual dysphoric disorder (PMDD): severe emotional problems occurring before menstruation.

premenstrual syndrome (PMS): a combination of physical and mental symptoms which occur approximately a week prior to menstruation, some women's symptoms are much less apparent than others.

prepuce: the tissue that covers the glans of the penis or clitoris.

priapism: continual and uncontrollable painful erections.

progesterone: hormone released by the ovaries which causes the lining of the uterus to thicken.

prophylactic: a material that is used to prevent against infection; the condom.

prostate: the gland that produces some of the components in semen.

prostatitis: inflammation of the prostate.

psuedohemaphroditism: a condition in which testes or ovaries are present in addition to external genitalia of the opposite sex.

pubic hair: hair that grows on and around genitals, appearing for the first time during puberty.

pudendum: external female genitalia.

rape: sexual intercourse without consent.

rape trauma syndrome: the reaction of events the victim of a rape goes through.

rapid orgasm: when a woman climaxes more quickly than her partner.

rectovaginal exam: a medical exam of the reproductive organs and the tissues that separate the vagina and the rectum.

refractory period: the period after orgasm when a man can not become aroused.

resolution: the time when the body returns to its normal state after orgasm.

retarded ejaculation: another term for inhibited orgasm.

retrograde ejaculation: a condition in which semen flows into the urinary tract and then the bladder during ejaculation.

role play: the acting out of fantasies.

sado-masochism (S&M): sexual activities revolving around bondage, domination, pain and humiliation.

safer sex: ways in which people reduce the risk of transmission of infections during sexual intercourse.

scabies: mites that burrow in around the underneath the skin to lay eggs which causes redness and itching, they may or may not be sexually transmitted.

scrotum: the pouch of skin which houses the testes.

secondary sex characteristics: adult physical characteristics that are caused by hormones during puberty.

self-gratification: pleasuring oneself sexually.

semen: the male ejaculate which contains not only sperm but fluid from the prostate, seminal vesicles, and Cowper's gland.

seminal fluid: the fluid that is mixed with sperm to help it move through the body.

seminal vesicle: a gland that secretes fluid into the ejaculate.

seminiferous tubules: a network of coiled tubules which are constantly producing sperm.

serial monogamy: a pattern of involvement in which one goes from one serious sexual relationship to another.

sex: the classification of people as male or female. At birth infants are assigned a sex, usually based on the appearance of their external anatomy.

sex drive: natural urge to have sex.

sexism: a prejudgment that someone will posses negative traits because of their gender.

sexology: the study of human sexuality.

sex play: any voluntary sexual activity that may or may not be done with a partner.

sex therapy: treatment that is given to resolve sexual dysfunctions.

sexual abuse: sexual that is nonconsensual and harmful.

sexual assault: nonconsensual sexual activity that involves forces or the threat of force.

sexual aversion disorder: a condition in which one fears any type of sexual expression.

sexual conflict: an inconsistency between sex drive and sexual inhibition.

sexual desire: a physically arousing attraction.

sexual discomfort: problems that occur with sexual activity that are not as severe as dysfunctions.

sexual harassment : unwanted sexual advances that are often hostile and degrading.

sexual individuality: the different sexual needs, fantasies, and feelings of each individuality.

sexual intercourse: sex play where the insertion of the penis occurs.

sexual orientation: describes an individual's enduring physical, romantic and/or emotional attraction to another person.

sexuality: the emotions, feelings, sexual preferences, sexual orientation and societal norms that influence individuals.

sexually transmitted infections (STI): infections that occur as a result of sexual fluids passing from one person to another.

shaft: the long part of the penis that extends from the body to the head of the penis.

smegma: sticky, white substance produced at the glans of the penis by bacteria and bodily oils.

sodomy: a term used to describe oral or anal sex.

spectatoring: self-observation during sex.

sperm: the male reproductive cell.

spermicide: a chemical that kills sperm.

spermarche: the time when the testes first produce sperm.

squeeze technique: a technique used to end premature ejaculation in which the man masturbates and then squeezes his penis to prevent orgasm.

squirt: the term used to refer to female ejaculation.

statutory rape: voluntary or involuntary intercourse between an adult and someone who is not legal at the age of consent.

STD: sexually-transmitted disease, also referred to as "STI".

sterilization: medical procedures that are done to inhibit people from reproducing but do not affect sexual desire.

stop-start technique: a technique used to control ejaculation in which the man gets close to orgasm then stops stimulation.

suppositories: contraceptive devices that are placed in the vagina and releases spermicide by melting or foaming.

swinging: the practice in which married couples switch partners.

syphilis: an STI that progresses through four stages which begin with the presence of a chancre and if untreated can end in death.

tenting: the expansion of the vagina during sexual stimulation.

testes: the male gonads.

testosterone: the males sex hormone, aids in developing secondary sex characteristics and sex drive.

thelarche: the period when girls' breasts begin developing.

thrush: a disease caused by a fungus in the oral cavity.

toxic shock syndrome (TSS): a rare growth of bacteria in the vagina that can be associated with tampon or contraceptive use over a long period of time without removal.

transgender: an umbrella term for people whose gender identity and/or gender expression differs from what is typically associated with the sex they were assigned at birth.

transgender man: people who were assigned female at birth but identify and live as a man may use this term to describe themselves.

transgender woman: people who were assigned male at birth but identify and live as a woman may use this term to describe themselves.

transition: referring to transgender individuals. This process may include but is not limited to coming out as transgender to family/friends/co-workers, using new names or pronouns, legally changing name or sex on legal documents, hormone therapy, and (not always) one or more types of sexual reassignment surgery.

transsexuals: an older term that originated in the medical and psychological communities. Still preferred by some people who have permanently changed - or seek to change - their bodies through medical interventions (including but not limited to hormones and/or surgeries).

tribadism: two women rubbing their genitals together.

troilism: sexual activity with three people.

tubal ligation: a medical procedure to sterilize women by block the fallopian tubes to prevent the meeting of sperm and ova.

tumescence: a buildup of sexual tension in both men and women.

Turner syndrome: a condition in which females are born with only one x chromosome and therefore they may be missing or have deformed ovaries.

typical use failure: the measurement of how often birth control is likely to fail when taking into account human and technical error.

uncircumcised: a penis which still has a foreskin.

ureters: the tubes which connect the kidney to the bladder.

urethra: the tube and opening through which urine passes in both men and women.

urethral bulb: part of the male urethra that holds semen prior to ejacualtion.

urinary tract infection (UTI): an infection of the bladder,ureters, and urethra caused by bacteria, that can be sexually transmitted.

urophilia: sexual arousal connected with urination.

use-effectiveness: the reliability of a contraceptive as it is usually used.

uterus: the female organ in which the fertilized egg implants, and develops into a fetus; also the organ from which a woman menstruates.

vagina: the female sex organ that the penis is inserted into during intercourse, also the path that the fetus travels at birth, and menstrual fluid flows from.

vaginal discharge: fluid normally excreted from the vagina with the purpose of keeping the vagina clean.

vaginal intercourse: intercourse.

vaginal ring: an experimental birth control method where a donut shaped device is filled with hormones and placed in the vagina to prevent ovulation.

vaginismus: a dysfunction with continuous painful spasms in the vagina.

vaginitis: the inflammation of the vagina.

vas deferens: tubes connecting the testes to the ejaculatory ducts.

vasectomy: a medical procedure in which the vas deferens are blocked to prevent impregnation.

vestibular bulb: tissue on either side of the vagina that fills with blood during sexual stimulation.

vibrator: a mechanical device used to massage erogenous zones.

virgin: typically referred to as someone who has not engaged in sexual intercourse.

voyeurism: a paraphilia in which sexual arousal becomes dependent on watching others who are nude or involved in sexual play.

vulva: the external female genitals.

Western blot: a test used to confirm the presence of HIV antibodies after the ELISA test.

wet dream: sexual dreams that cause ejaculation.

withdrawal: a type of birth control where the penis is removed from the vagina prior to ejaculation.

yeast infection: an overgrowth of a fungus usually present in the vagina.

zoophilia: a paraphilia in which sexual arousal becomes dependent on animals.

zygote: a fertilized egg cell.

zygote intrafallopian transfer (ZIFT): the product of an in vitro fertilization is medically placed into the fallopian tubes.

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