My personal opinion on the matter is that I don't believe that trans/trans sex is gay, but I do believe that it's bisexual. And how could I not? You're getting both worlds. You could say that the person has changed their gender, and live their life as one gender or another, but if they're still packing the same genitalia from "who they were", then they're not truly letting go of that. I'm a realist, and I'm all about embracing everyone, and not passing judgement. But I do believe that far too many of us acknowledge that there's a gray area, and try to stretch it out until it blends in with the black or white.
What I mean by that is if you state that you're a heterosexual male, but I love you trans and you're not into guys at all, then you're fooling yourself. You may not appreciate the mannerisms or appearances of men, but you do enjoy their genitalia. Call it for what it is. If you're blowing a trans, then we're both cocksuckers. My degree just stretches a bit more than yours.