I am maybe a little more black and white then most of you. If it has a dick its a guy and I don't want to fuck it. No problem if you do and I don't care much about labels, but you are at least curious if not bi. I have been in a few threesomes, but typically want to be the only hard dick in the room. I would also be upset if I went with a full Trans-op without knowing about it, so perhaps I am a bit uptight, but "I ams what I ams".
The whole born a male/woman thing and competing in pageants/sports for the other sex could be a completely separate thread.