I've never had a problem with it....they may look, but who're they comin back to?
I've been to strip clubs a couple times...once with my ex and a bunch of his fraternity brothers, and once on MY birthday (with him and a couple friends). My bf at the time even bought me a boobie shot.
I've yet to go to a male club though...I'm not really interested in going to any sort of club nowadays...
Anyway, the point is it really is just entertainment for him, if you don't like it, ask him to rent a porn he can watch at home
(or suggest that to your friends who were so appalled!)