If he's getting into fights because some other guy is eyeing up the chick's tits that he wants to go home with, then yes, it is a direct effect of being at a strip club. In fact, you might be able to make the argument that him going to a strip club the night before and not getting into any trouble was a good thing on his part...that is, if you're going to make the case that inherent environment of a strip club caused him to act like a dick. And, in regards to the alcohol at strip clubs, there are plenty around that are 18+ for age and don't serve alcohol. I don't know if these are the ones he visits or not.