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A term coined recently by a comedian from C4's 8/10 Cats, generated randomly during their Countdown session. Hilarious.

Research concludes that the term currently has no official definition, however the etymology of such associated practise refers to erotic asphyxiation or breath control play, which is the intentional restriction of oxygen to the brain for the purposes of sexual arousal. This sexual practice is variously called asphyxiophilia, autoerotic asphyxia, hypoxyphilia. The term autoerotic asphyxiation is used when the act is done by a person to themselves. It has allegedly been around since the 17th century.

Author George Shuman describes the effect as such, 'When the brain is deprived of oxygen, it induces a lucid, semi-hallucinogenic state called hypoxia. Combined with orgasm, the rush is said to be no less powerful than cocaine, and highly addictive.'

Think David Carradine; Michael Hutchence (allegedly).

My definition would therefore be something along akin to:

'The act of submerging another's head in a liquid in order to induce erotic asphyxiation for the sole purpose of sexual gratification by either/both consenting parties.'

Discuss at your leisure!
Bob was well into freaky shit so Brenda held his head in the fish tank whilst she ploughed him like a field. Thankfully, Bob lived to tell the tale and has reportedly engaged in subsequent sex-drowns.
sex-drown by MiniDynamo March 27, 2016
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sex down 

To engage in intercourse with any female numerous times as primarily a booty call.
How's it goin Kimmy-sex-down?
sex down by Phartman July 9, 2004

Legs Down Sex 

Usually reserved as a "finishing move" during heterosexual intercourse. While the male and female engaged in Missionary Position intercourse the female lowers and closes her legs and the male then straddles her thighs an continues to thrust, making more contact with her tightened vaginal canal and clitoris thus increasing both the chance of and intensity of the female's orgasm. A secondary benefit is if the male is going to "pull out" he is in the perfect position to dump his load all over her stomach and breasts.
Frank and Renee were reaching the point of no return when she moved to Legs Down Sex so she could cum hard and fast before jacking Frank's crank all over her tits.

hand me down sex 

sort of like hand me down clothes
but in a sexual meaning...

when your friend is tired of his girlfriend, having sex, he passes her down to their friend in order to fulfill his needs, because he's tired of wearing her on his cock...

see joke sex
Bro I just had sex with Tony's gf...

Thats not sex, thats hand me down sex, she's available b/c Tony passed her down to other guys...
hand me down sex by blthrskt April 24, 2009

Upside down sex 

1) When you hang upside down and fuck eachother
2) When you 69 while you holding the girl upside down
Upside down sex by bt#1 October 9, 2009

upside down monkey sex 

One partner hangs upside down from a high place, while the other partner runs around the room and beats their chest while shrieking at the top of their lungs. Once out of breath the hanging partner must fall down on top of the other partner's back and they must wrestle to figure out who is the dominant one.
"Hey fellas, see that girl over there? She is into all kinda of weird stuff, even upside down monkey sex!"