Do males, on average, crave variety in relation to sexual partners more than females do?

I was thinking about this recently. On stag nights for example, men in happy relationships will often mess about with strippers and some will even sleep with prostitutes. Of course women rarely find out about this. I don’t believe this type of thing goes on anywhere near as often on hen nights. Do males appear to be generally less emotive when it comes to sexual encounters than females are? Is there a predatory instinct men have that women do not? It seems that most women on any given night could go out to a bar and sleep with a man if she desires – yet the same can not be said about men whom generally need to work a lot harder for it. It seems that the ratio of men seeking a casual sexual encounter far outweighs those of women. Finally, do most men also seek/desire variety? I recently heard a man say in relation to women (and his wife) that he has a favourite wine he drinks that will always be his favourite wine, but that doesn’t mean he wants to drink it every night. Is this comparison realistic?