I'm primarily attracted to women, but I'm a "never say never" kinda guy. I've been with guys in the past when I was living as a girl (and was married to one, had kids with him, etc), but I left that life so that I could be myself (at that time, I identified as a lesbian, but realized later that was a "baby step" towards becoming the real me - the male me) and be with people of the gender I'm most attracted to.
That being said, I've always had a teensy tiny little bit of attraction towards some men, some of the time. And now that I'm living (at least part time as far as other people are concerned - but full time in my mind) as a guy, I'm less "put off" by the idea of being with guys, although I'll probably not act upon that still.
Add to that the fact that my partner is a female-bodied, androgynous gender-queer (Self-identified as closer to the male end of the spectrum. Would rather be gender-neutral, but likes being sir'd and hates being maam'd.). I think I hit the jackpot with my sweetie, cuz I really love that sie is able to be fluid with hir gender expression, and I can also be somewhat fluid with my orientation, while still being with a female-bodied person (as this is what I'm more attracted to than male bodies, although not exclusively).
I do find many FTMs and MTFs to be attractive, and I wouldn't have a problem if they were pre- or post-op. I find some bio-guys to be attractive, but could only be with them if they truly saw me as a guy. I find bio-gals attractive (obviously) but find queer chicks to be hotter than straight chicks (to my eyes at least).
I'm kinda confusing that way I guess. lol