I chose gay. By and large, that is accurate in every way. But I've never been very sexually motivated in the first place, so it does not seem inconceivable that I could potentially fall in love with and have physical relations with someone of the opposite sex. The way I look at it, sex can either be merely a form of glorified masturbation, or something totally transcendent that people with a profoundly deep, indelible bond can communicate "spiritually" through. That's not to say that sex is ever absolutely one or the other, but real (read: consensual) sex always exists on a continuum somewhere between the two.
While I don't see myself ever getting that close to a woman or someone transitioning MtF, FtM or somewhere in between, I certainly don't consider it out of the question. I do believe in my own capacity for love/interconnection that goes beyond gender and corporeal presentations. I just think it's much more likely to happen with another man because I naturally default to my physical/romantic predilection for men before ever getting very emotionally invested in people as individuals.