I wouldn't have sex with a trap/crossdresser. I don't consider t-girls to be traps, totally different bag of fish, whatever you think on that front is up to you. If I were gay I would have come out ages ago IDGAF
. But anyway when you first started watching porn did you look at vaginas and think, wow, that wrinkly slit looks awesome! I mean maybe you had sex the first time you saw a vagina, in which case, wow. But when you're looking at a woman when you're younger you're probably more focused on curves/feminine features. At least that's how it was for me. Didn't care much for the vagina part until I was like 13, at which point I had already gotten into futa stuff.
I wouldn't say it's a fetish in the sense that it gets me off more than mainstream porn, it's that I like futa/t-girls stuff equally as much as mainstream porn. Plus copy paste the response above.