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

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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

The Urban Dictionary Mug

Lotsa space for your liquids.

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The Urban Dictionary Mug

Lotsa space for your liquids.

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The Urban Dictionary Mug

Your favorite word on a white mug.

Create a mug

The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

Buy the mug

The Urban Dictionary T-Shirt

Soft and offensive. Just like you.

Buy the t-shirt

The Urban Dictionary T-Shirt

Smooth, soft, slim fit American Apparel shirt. Custom printed. 100% fine jersey cotton, except for heather grey (90% cotton).

Buy the t-shirt