Even though man has instincts, it's not clear at all how they relate to gender. On top of which, rationality, neurosis, and society can alter the expression of these instincts especially when it comes to gender. If you had a person who was raised alone (maybe raised by a robot or something) I'm not sure what kind of behavior could be expected without a gender specific role model of some kind. It really wouldn't surprise me if the person did not fit into what we normally think of as traditional gender roles. Lets say there were two males raised this way... (we can call them ernie and burt for fun), instincts would likely create behavioral differences probably on the basis of dominance and you might end up with something resembling gender behavior yet the behavior would not at all be determined by biological sex. In society, how someone groups themselves in relation to others enhances how they could be more masculine or feminine beyond nature. For instance in the Victorian era it was common for wealthy , masculine men to wear makeup, curly wigs and lace, while women who did the same were often prostitutes. So, if society defined masculinity by what we define femininity as, might you rather identify as male? So i don't think the culture is "tranny driven," but i think that the phenomenon emphasizes the fact that these roles are fake and keeps them from overly stagnating or separating to far from one another.

RE: Criticism of a Gender Theory, and a Scientist Under Siege