For me, and I am hetero - gay porn doesn't turn me on at all -, it has to be a shemale with a unambiguous feminin face. I have to *believe* it's a woman I think. And then seeing a dick plus perhaps wonderful breasts is maybe simply getting the best of both worlds? Also with a shemale you as man can be passive part, should be interesting to explore. Especially if you like your anus when playing with yourself. :-) Or is it the total lack of gymnastic talent why I am visualizing to lick a dick between legs of another person (woman)?
If I had a wish free I clearly would prefer a beautiful ladyboy to an otherwise equally attractive 'normal' woman. I don't know what it is, but it is very addictive.
So far only in my imagination but who knows ...
I can't imagine a world without shemales anymore. The best about it would be missing!