9. Ego Boost
Man has always been the one to chase after woman from time immemorial. So, let's look at man like a hunter. A hunter usually has an ego boost whenever he goes out hunting and comes back home with a juicy kill. The more difficult the kill, the bigger the hunter's ego. It's the same with men in relationships...they want to conquer all. Even when they have a great girlfriend/wife, which many consider a great catch, they might still go out of their way to conquer another rare specimen just to get that ego boost. In situations like this, it is mostly sexual. Once the guy has 'hit it,' he would probably bounce.
