I'm a gay cis dude and I'd date a trans dude. If they're cool and there's a mutual attraction, great!
I'm not scared of vaginas; I'll go down on them like a champ and learn something new, hopefully, if they let me and so long as they don't mind that I'm inexperienced. I'm willing to broaden my horizons. I know some straight dudes don't even like going down on their cis girlfriends. Those poor women.
Younger gay me wouldn't have thought he'd have to worry about getting someone pregnant, but it's a whole new world out there, especially as someone who would prefer to bottom, ha. But that's why there's toys and shit for double the pleasure. Get fucked while fucking, etc. Or just be the bottom anyway, but that feels like a waste. Verse it up.
I don't feel like enjoying a trans partner's genitals would make me any less gay, but that seems like a very unexplored can of worms. It's usually one seen from the majority: aka straight people (okay, I'm mainly talking about cis dudes). I can only imagine some of the hang-ups. "If I'm a dude but like a pre-op trans girl, am I gay? Bi?" Then there's male fragility, which I imagine something along the lines of, "What if their dick is bigger than mine?" or "I just don't wanna see another penis besides mine."
"Ew, penis," and "But biological children" are zzz. But that's just me. I wouldn't want to pass down my genes, what with my depression and all. I'm only half of the equation, but I don't want to see my imperfections in my own child. I think adoption is a wonderful thing, and I'd gladly go that route, but I don't blame anyone at all for wanting biological children. I'm not blind to the appeal of seeing something you helped create running around and eventually carrying on whatever legacy you think you have.
I do wish adoption were faster and a little easier so more children would find loving parents, though, gay or not.
Well, that's been my gay two cents. Hopefully it gets easier for trans people when it comes to love and sex and all that shit in the coming years, and hopefully more people are willing to educate themselves on trans struggles.