What mussels are being worked durning sex?

[The Outsider]

Serious question.
So i made a spelling mistake. Only human.

 

[Craig F]

Yo dick muscle gets a good workout. Depends on what position for other muscles.

 

[Conlin]

It depends on what position.

 

[Conlin]

It depends on what position.

 

[Midnight.Rain]

lower abdomen, legs, thighs, hips, and as said before it all varies on the positions.

 

[¡Andrew!]

All of them. In and out in and out. Mostly your hips and lower back muscle though... And the penis is a muscle thats also worked... I would imagine.