"Identities"? Go fuck yourself. You don't "identify as" male or female. You ARE male or female, because you have a cock or a vag. Simple as that. Why do liberals like shit like this?
I wish it were that simple. It would save a lot of people a lot of misery. Unfortunately we organisms are unimaginably complex, and it turns out that, although the vast majority of the time it comes down male/female, things do land on a spectrum in terms of biological sex.
(heterosexual male upper-middle class white American here...)
http://en.wikipedia.org/wiki/Intersex