Oh, Brother, you wouldn't believe how many times I've tried to explain this to women. But all I got to hear is: "Men are just dogs and nothing else!" I do think this whole female chasing and falling for another woman has a genetic aspect to some extent. That's not an excuse for cheating, of course. I'm just sharing my opinion here. Sure, we can make a conscious decision about whether to engage in an affair or not. But the truth is: Evolution gave us the strong sense of wanting to secure our species. Therefore, the males of many species, including us, have mated with as many females as possible. This remnant of evolution is still slumbering within us. Some can and want to control it better or more consciously than others. Others don't know limits and will take any chance they get. I know. But in my opinion, this is one reason why men react so strongly to female stimuli, regardless of being in a relationship or not. My mother told me just because a man is in a relationship doesn't mean he's blind or neutered. So to all the people out there, take care of your partners, before someone else does.