You seem to be attempting to set us up on opposing sides of this issue.
I've been to clubs where people are nude, and also clubs where people were having sex in plain view. Trust me, I am a proponent of the sex positive movement; however, someone is going to be physically injured if they grab one of my body parts without prior agreement.
So, if clubs want to be on record as a place where this happens--great!
If women like it, accept it, and don't report it--great!!
But, I think you can foresee what's going to happen. What can be really tittilating (hah, pun) for some women can be psychologically damaging for others.
An establishment can be sued.
Not sure if they'd be culpable. Not sure if a guy who sees this happen myriad times with no negative results, and so then tries it himself and gets dick-kicked and sued has any legal support. What do you think?