This thread is so ridiculously off-topic it's absurd. It's hard to say whether diaperdragon's post was actually trolling for a response from trans-people here or if it was just made to be obnoxious. But I really want to respond to some of the things that have been said, so...
http://en.wikipedia.org/wiki/Transsexual#G...nssexual_people
This seems like a really overly simplistic view of both gender and sex, and it doesn't seem like you're taking the difference between gender identity and biological sex into consideration at all. Even if you could completely throw out the idea of one's gender identity not matching one's sex there are a number of intersex conditions that make a person's biological sex ambiguous. These articles are informative on both subjects:
http://en.wikipedia.org/wiki/Intersex
http://en.wikipedia.org/wiki/Gender_identity
Alternatively, if you don't trust wikipedia, you can have a look at some of the articles cited in the references sections.