I'm similar to many who have posted already but also dissimilar in my way. I have always been attracted to females. In my previous life, I had no attraction whatever to men, but my problem was that women expected me to behave as a male, which was mindbending torture. At least in this one area I have always been very clear that I am female and nothing but.
Since transition, I see men differently and occasionally really like one in an emotional sense, but the physical side is still nuthin', sugar pea. I am still strongly and happily attracted to females.
I had been afraid of two things in transitioning: one was that my romantic life might be over. Ha! The reality has been that, because I am now living and being preceived as my real self, my romantic life has been much more active than it ever was before. My other fear had been that I would lose my attraction to women (adoration, really). That would have been a primal piece of myself to lose, but there again, no worries. Yay!
It has always been femaleness that draws me--I hesitate to say "femininity" because that implies a whole set of behaviors--and I can be very attracted even to a strongly female-identified genetic male.
The one thing that IS very changed for me is that I find a far greater range of women attractive. I think this is because I "see" other women better than before, and so see their beauty from a deeper place.