The thought of being physical with guys disgusts me?

Okay I've always only liked guys. But I've always had a thing for feminine guys, gay guys, transvestites, and even hermaphrodites. I've never liked girls, so I'm not a lesbian. So I consider myself to be straight, with a thing for girly guys. HOWEVER, the thought of having sex with a guy disgusts me. In fact most of my relationships have ended because I just can't imagine being physically involved with the guy. I don't get it. Am I meeting the wrong guys or what? It just doesn't make sense to me why the thought of being physical with guys I like repulses me. This is not to say I don't get horny. I'll be honest, I have a very strong sex drive.