We are also human (as weird as we act sometimes), and therefore have some of the same drives guys do.
To take this to an animalistic standpoint: I think that men are more driven to reproduce while women are more driven to nurture, which is why it doesn't seem 'quite' as bad. But yeah, before the children come, there has to be a father.
And, of course, many of us will deny it. Society has hampered us much more over time than the guys... the whole 'slut' versus 'good with girls' double standard and all of the cultural ones from the middle ages that are just wearing off today.
But do we check out men?
I guess how hard it is not to varies with the girl, just like it does with the guy. I have to force myself not to, but I'm good at not getting caught anyways. ;)