Great question Sweetpea as I myself have wondered that. I think I am more confused now. Wish it was more black and white but I'm learning nothing in this world is black and white, why would I assume this to be.
I used to have a fantasy about being with a woman, I'm not attracted to women and I don't think I am lesbian. I never could act on it, but when I found out my BF liked to dress I thought to myself..."self, this IS the woman you have fantasized about." Maybe that is why I could never act out on it before...And I consider myself totally straight. Being in a long distance relationship I haven't had the opportunity to see if I would act on it with him/her or not yet.