Before I started HRT, this very subject fascinated me to death. I was curious how might my sexuality evolve under the influence of hormones. Going into this, I had some very definitely thoughts, but I was not completely sure. As a male, I had never been with a man, and for most of my male life, I can't say I was really attracted to men. But in all my visions of myself as a female over the years, I was a very enthusiastic heterosexual. Because of that, I was always somewhat suspicious that I was a very very repressed bisexual.
There is another aspect of this that deserves mention here: Regardless of my preference, I felt inside I was a bottom in the sexual sense, yet my role as a heterosexual man forced me at times to perform as the top. As the years moved on, and my dysphoria grew worse, I managed to get to the point where I could look at a man, and realize that my inner female would find him attractive, but those were only a select few.
Still, I had my suspicions about what would happen under the influence of hormones. What I discovered pretty soon after starting HRT was that the walls started crumbling. The very nature of my body sensations changed, and any notions of being a top, pretty well disappeared into the ether. Into that vacuum, my more passive sexuality quickly took hold. And I found that the gender best equipped to respond that new sexuality had penises. Suddenly, I looked at men in a new way. Many suddenly became a lot cuter. This is far more than just a physical thing; I crave now emotional connections with the more masculine gender. I now pine away for a day when I have had my SRS, and a man will take me to bed, and make into the woman I have always dreamed of being. Men give me the tingles now; but I sort of thought it would go that way all along.