There's nothing wrong with putting tranny cock in your mouth, or bottoming for trannys; we just need better-looking guys willing to do it. Ramon and Christian make me want to fucking vomit.
Ok, then, serious question, and I'm not trolling, just genuinely curious. If you're "straight", and have no desire to suck a tranny or bottom for one, you JUST want to top and get blown by them, then the fact that they have a dick doesn't really enter into the equation, right? If that's the case, *why* seek out trans chicks at all? Everything you want you can get from regular girls.
The chick having a dick is what defines trans women and trans porn. So if you deliberately seek out either, it seems to me that logically, the dick is at least some of what is driving your interest. And a guy who is specifically interested in dick is not what I'd call "straight". I mean, call yourself "heteroflexible" or whatever, but straight would mean you wouldn't be attracted to dick at all.