Then, BigGreen, perhaps you're a latent homosexual. Not too many guys are able to have many female friends that are close without destroying the friendhsip with sex.
Seriously now... still, look at your friends. Are your girlfriends goodlooking, entertaining, fun, intelligent? Check out how they interact with other people who are not in your group, and it's likely that you interact similarly with outsiders.
If you have a large amount of close girlfriends, then there's obviously a large part of you that is able to share feelings well and to communicate. Based on the way you've interacted on the message boards, you do like to open up and chat, which is a great characteristic for a guy--not too many have that ability unless it's coated with games-playing or immaturity.