Top Definition
a nervous twitch during an orgasm or just before intercourse, in which one individual "flinches"...a bit like tourettes....and makes the other person included in the sexual act laugh and chuckle...laughing and chuckeling is a major turn on for some people...so people with a "sex flex" are not left lonely!!!
person 1: mmm....yeah baby
person 2: *twitches*
person 1: omg wht was that?! hahaha! u sex-flexed!!! oh yesss! i am the god of sex!!!
person 2: *blushes* i have ....tourettes....
person 1: sex-flexing is THE biggest turn on ever.....mmmm.....do it again....
by Caroline Ratcliffe June 11, 2006
1 more definition
A former lover, present friend, who one occasionally has sex with.
If it weren't for my sex-flex, I wouldn't be getting laid at all.
by Kaichester August 29, 2009

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