sex muscles 

The curves of well-defined abdominal muscles that start at the lateral iliac crests and end medially at the pubic tubercle. They form the "V" that outlines a 6-pack. They are referred to as such both because they can be worked out during sexual activity, and possession of such musculature makes you want to have sex with that person.

Did you see his sex muscles when he took his shirt off? I think i just peed my pants a little.

sex muscles by dichron October 30, 2007

Sex Muscles 

Any and all muscles that are bulging or well-defined from sexual activity.

Me: Did you see the size of his biceps? That's hot - his chest too.
Her: Those are some damn fine sex muscles.

Sex Muscles by Siouxsie Supertramp May 8, 2020

Sex Muscles 

Any and all muscles that are bulging or well-defined from sexual activity, typically the biceps.

Me: Did you see the size of his biceps? That's hot - his chest too.
Her: Those are some damn fine sex muscles.

Sex Muscles by Siouxsie Supertramp May 8, 2020

Sex sore muscles 

When having sex with someone and using muscles you normally don't you're very sore it has nothing to do with not being able to walk.

I was with Jake last night and I have sex sore muscles.

Sex sore muscles by Roomate Girl May 7, 2016

muscle sex 

Anal sex with a large bodybuilder where he preferrably bottoms.

I had the sweetest muscle sex with Mr. Olympia just now. His 20-inch arms pushed me deeper into his hole to stroke his sphincter and pleasure his prostate. His glutes throbbed against my cock as he came after I fucked his muscle ass right nice!

muscle sex by Know-it-all-but-not-do-it-all September 25, 2009