Like it or not, there is a double-standard regarding sex for men and women. It has nothing to do with your intellect, except you should be able to use it to figure this out. I will say when I was younger (and dating, now I'm married) I never entertained the guys who I thought might be the sort to do what you describe. I also never slept around or early in a relationship (yes, I actually had to be in a relationship to even consider sex). Times are different now as far as the social scene I gather, but I think that there are still men who value a woman who doesn't give it up too easily. I mean, in your case especially, whats the rush? Its not like its all you have going for you--I'm sure you are very interesting, can make great conversation and have cool experiences to share. If a guy can't appreciate that about you, then why would you ever want to sleep with him?
Second thoughts can generally be amended with judicious action; injudicious actions can seldom be recovered with second thoughts.
--Cyteen by C.J.Cherryh