While I haven't been in this kind of situation before, I believe that I know where you're coming from - from an opposite point of view. I happen to love women sexually, and I always have. However, I've always been the type of guy who can willingly admit that some men happen to be gorgeous; physically, intellectually, and what have you. But unlike you, I am sometimes sexually attracted to men - however, never to the point where I want to sleep with them (I fantasize about them, yes, but... ) The idea of really sleeping with them or doing anything sexual completely sends me off the deep end. I know that all of this sounds very strange, I don't know how to explain it any better than this.
As for what you should do about it, well...I'm not sure.
I would say, that if you have the urge to be with a man, then...be with a man and start calling her a friend. It's not like you can control that urge of yours, and you don't want to suppress it while allowing her to call you her boyfriend (We all know that plenty of women out there get emotionally involved even when they try to tell themselves that we're 'just friends,' But some men do this too, ) Still though, I'm assuming that you don't want to hurt her, so it might be best to cut it off and remain simply as friends.
