Are you gay, straight, or bi?  Male or female? Those are the overwhelming FAQs on this board.

There's a new late-night documentary on HBO that seriously addresses the repetitive questions that are asked here: "what sex are you if you like making it with transexuals or if you are a transgender?"

Narrated by Gore Vidal, it gives the closest to definitive answers I've seen, and it's an absorbing piece of science, as well.

The best news in it: there are an estimated 300,000 ladyboys in Thailand, plenty to go around.  HBO needed footage, so there are extended interviews with some hot ones.

I recommend watching it, and I recommend referring to it when tiresome people like Tranny Manny chime in.  If you can't watch it, look at the web page, at least:

http://www.hbo.com/docs/programs/middlesexes/index.html