Now THAT is the type of explanations I am looking for. Thanks guys! The things you say really do make sense when looked at from the bizarre male point of view.
If I am understanding right, men need the male ego boost of having more than one women, but they also need the security of not having competition from other men.
You men are a strange breed, but at least I sort of understand a little better, kinda, sorta. 
Because I don’t equate dating with sex (or sex with dating in some cases ;)). There is a huge difference between a relationship that is romantic and one that is romantic AND sexual.
So far I have kept control over the kissing situation. I know that I have very little self control once a certain point of physical contact is reached. The touching/kissing has stayed within the boundries of being able to do it in public without getting arrested. The goodnight kisses have been pretty passionate but still beneath the level where I pull them inside my front door and rip off their clothes.
Again, there is that fine line that I think most of us understand. The line where physical contact goes from romance to sexual contact. I have yet to cross that line with any of them.
All in all, it really hasn’t been a big problem. It is just a situation that I have had to deal with a few times lately and I’m just trying to understand.