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Udder Nonsense: Playing with breasts.
Ugly Duckling Syndrome: An attractive person who bloomed late in life and still has the personality of an ugly person. Often used to describe an attractive person who is uncommonly nice or who dates people far less attractive.
Umbrella: While fisting an orifice, the fist blossoms open like an umbrella's spines.
Umlauts: Breasts. Specifically, breasts of Germanic origin.
Unbirthing: The sexual fantasy of crawling into a vagina. Particularly popular among furries and hentai enthusiasts. Sometimes associated with voraphilia, in which a person fetishizes the idea of being ingested. Pop-culture references: Nirvana's "Heart-Shaped Box": "Throw down your umbilical noose so I can climb right back."
Unbutton the Mutton: To take out one's penis.
Uncle Fucker: A gay man.
Unclog the Drain: Female masturbation.
Under Boob: The underside of a perky set of boobs that is exposed despite the nipples being covered.
Underwear Fetish: A fetish for underwear. This usually involves men who like to smell, wear, or collect unwashed panties.
Upper Decker: When you defecate in a toilet’s water-tank. Often a kind of ticking shit-bomb planted as revenge during a party.
Up Skirt: The view up a woman’s skirt. Often refers to the illegal practice of obtaining such a view without the woman’s consent.
Urethra: The tube that transports urine out of the bladder. Also, in men, the pathway through which seminal fluid is ejaculated.
Urethra Play: The act of inserting objects into the urethra to inflict a mixture or pleasure and pain. Synonyms: Sounding.
Urinate: To empty the bladder. Synonyms: bleed the liver, drain the lizard, drain the radiator, drain the snake, leak, make water, number one, pass water, pee, pee-pee, piddle, piss, shake the dew off the lily, see a man about a horse, spring a leak, squeeze the lemon, syphon the python, take a leak, take a piss, tinkle, water the horses, wee, wee-wee, whiz, wring out a kidney, wring your sock out
Urine: What is emptied from the bladder.
Urolangia: A fetish for watching others drink urine.
Urophilia: A fetish for being urinated on or for urinating on another. Variations: golden shower.
Ursusagalmatophilia: A fetish for teddy bears. Also, a fetish for dressing up in animal costumes. A form of plushophilia, which is a fetish for stuffed animals. Variations: furries, plushies.
Urtication: A BDSM practice of using nettles to sting a partner's skin, causing them to develop hives. The practice was once used to treat paralyzed body parts.
Uteromania: Unbridled sexual desire in a woman. Synonyms: nymphomania.
Uterus: Where fetuses develop in the female of most mammalian species. In human females, the uterus is bookended by the cervix, which opens into the vagina, and by two fallopian tubes.
Uxorious: Showing excessive or submissive affection or fondness toward one's wife.