ta ta (noun) - Humorous term for breasts.
tea room (noun) - A public toilet where gay men often have sex.
teabagging (verb) - When a man lowers his testicles down onto someone's mouth. So-called because of the resemblance to lowering a teabag into water
tease (verb) - To cause arousal in someone or the expectation of sexual activity without following through on that promise.
tit fuck (verb) - To place the penis between a woman's breasts and thrust, as if engaging in intercourse.
top (noun) - 1. The dominant person in BDSM activity.
2. The one who penetrates during anal sex, especially between gay males.
taint (noun) - The perineum, the strip of tissue between the genitals and the anus of both men and women
threesome (noun) - When three people have sex at once. See menage a trois
train (noun) - 1, A line of men having sex, where each man anally penetrates the man in front of him, connecting together like the cars of a train. 2. A group of people lined up waiting to have sex with someone
transgendered (adjective) - Living as the opposite sex from which one is born, especially having undergone surgery and/or hormone treatments to make oneself appear like the opposite sex.
transsexual (noun) - Someone who has undergone surgery and/or hormone treatments to appear and live as the opposite sex.
transvestite (noun) - A man who dresses in women's clothing, make-up, etc. Usage note: transvestite usually refers to a man who regularly dresses like a woman and goes out in public that way.
tribadism (noun) - The lesbian sex practice of rubbing two vaginas together.
turned-on (adjective) - Sexually excited; aroused.
twink (noun) - A gay man, specifically one who looks young, has a slight build, and had little body hair.