If you actually knew anything about this subject, you'd know that gender identity is still rather rigid. Those who claim to be of ambiguous gender are an extremely small minority. They also happen to be vocal. Not only that, but these people have been here for generations, they just didn't have the forum in which to speak about it. Kind of like gay people. People didn't start being gay in the 60's, it's just that before the 60's they were pedophiles.