I totally get where OP is coming from but from the opposite direction. I was never interested in lesbian porn. If there wasn't penetration, I wasn't interested. In everyday life, I can count the number of times I was physically attracted to a male and noticed it, but women kept my head on a swivel. It's taken me a long time to realize I'm drawn to women out of jealousy and by getting close with a woman, smelling her scent, feeling her softness, it is a need of mine. Privately, men have always been my primary fantasy, back to my first ever climax. The problem is, I'm supposed to be the woman with a man, and being a man with another man is repulsive to me. That's not to say that I'm not aroused by women, obviously, since I've fathered two children and have a relatively active sex life with my wife.
After transition, I have little doubt that I will be a straight woman.