Weird ask...about trans woman

Why is it that I want to try having a relationship with a trans woman so that I get a duck as well as tits... please no hate.. but I am just stating how I feel. I just think that it would be a really good balance. But it would not be fair to them as I do not know if I could maintain a relationship with them. Maybe just try a fling with one... but I can’t just walk around asking for a trans woman... it is really weird... idk