Strip clubs??

So soon my boyfriend and father of my daughter will be turning 21 and i am not, whatsoever, comfortable with him ever going to a strip club. His older brothers are both married and they go to strip clubs when they get a little too drunk and I’m seriously dreading the day they try and get him to go too. Is this a stupid thing to be mad/worried about or is going to a strip club considered cheating cause in my eyes it totally is.