I knew that I'd already thrown in my two-pennorth on this subject somewhere, but couldn't find it until now - finally located it on another forum:-
I functioned adequately as a heterosexual male and have always fancied women only.
I've had half a dozen or so sexual experiences with guys, but it never clicked as Right with me. They happened because I was horny and broadminded enough to think "What the hell..... maybe it'll be fun..." when opportunities and situations arose.
I didn't
fancy the guys concerned - they were just there at that moment and not UNattractive.
With the later ones, I was kind of trying TO like it 'cos I thought "Well....this is probably what I should be doing" since I secretly wanted to be a girl and all.....
I'd NEVER actually fancied a guy in my life. I could look at some guys, or film-stars and think "Yeah..... I can see why women find him so attractive" - but I didn't actually feel it myself at all, it was just a dispassionate assessment and that's how it's been until age 54.
Then....... about nine months into transition, but pre-hormones, I got chatting to a guy one night who had by chance wandered into the place where I was at a trans-group meeting. He had no agenda there, had arrived by accident and was just sat quietly in a corner sipping his drink and watching events out of idle curiosity and a lack of anything better to do.
I went over to chat to him because I thought he had come for help and was too shy to speak up

I soon realised the situation, but he was interesting and I stayed because we had a great dialogue going and were simply both enjoying the chat.
.... about an hour in, I suddenly thought "Oh my god - I FANCY this guy!"
...and I really really did.

The first time ever, and I never believed it could or would ever happen.
That thought was immediately followed by "....but my body's wrong! "

... and that's another first - the first time that I've felt that feeling SO intensely and clearly and in that way.
I did fancy him. I did NOT want a gay-male relationship. I wanted him as a woman and the fact that I wasn't and couldn't almost made me burst into tears there and then, mid sentence. I had to flee to the loo and regain control.
Nothing happened between us - though it could have if I'd chosen 'cos he was mine, hooked and landed.... but it simply wasn't right for me, so we enjoyed each others company for a while longer and left.
I'd been propositioned many times before that night and have been many times in the year since by perfectly presentable, attractive guys but I'm not interested, not in the least attracted to them, just like I never have been all my life.
It was HIM ..... he was the one
So..... there you have it.
What little sex-drive I do have is solely towards girls, but I've had the startling revelation that given the right guy ....... maybe I'm not a lesbian after all