Well, with the way this is going, I think it makes alot of sense for the environment the fetus had in the womb.

About the hormone treatment though, I saw a documentary about a guy who was born a guy, but then something went wrong for his circumcision and so they just turned it into a gender reassignment and tried to have the boy grow up as a girl and simply keep the procedure a secret from the child so that she never knew that she was a boy. That lead to alot of problems because the...now girl, grew up being very emotionally unstable because of first, being teased, second, not knowing how to feel about the opposite sex. I think that sort of backs up the theory of being born a certain way, and after reading what CultureCherryPopper put, that makes alot more sense.