No matter how drunk I would get I would find it pretty disturbing, and wouldn't be able to bear it!
It would only happen if:
A) your friend was a really cute C/D
B) magically turned into a tgirl!
In any other way I would have to be attracted to my own sex, but I'm only attracted to women such as tgirls! Though I have to say if he had a huge feminine vibe and looked like Bill Kaulitz, I would think a little hard about it, because I always get this strange vibe from him that I cannot explain! There's an exception to every rule!