First of all, [url=http://en.wikipedia.org/wiki/Sex]sex[/url] is the biological definition of male or female. [url=http://en.wikipedia.org/wiki/Gender]Gender[/url] is far more the sociological and psychological aspects associated with the sexes. The people who have been fucking up these definitions can stop talking now. Whatever societal pressures are placed upon a sex is entirely arbitrary nowadays and was derived from our biological makeup affecting our behaviour in the distant past. For example, the male identity of seeking power and control is derived primarily from two biological factors: First, males are more disposable than females (one male can preggerz several females, one female requires several months to make one unit after incubation), second, males have significantly more testosterone, which leads to aggressive behaviours. As society evolved and grew, we grew around these as natural concepts, ergo why they're pretty common across the entire world no matter how isolated the society with only a few, rare exceptions. However, it should be noted that the few rare exceptions [b]do exist[/b]. Meaning that the societal aspect of "boys love cars" and "girls love barbies" is something we simply label, not something that is one hundred percent grounded in fact. Meaning that the only trait that should be considered in the face of the law and other institutions is purely your biological gender where determining such things as medical aid: Females, and males. How the female or male interprets him/her/itself is entirely irrelevent. Meaning a person can see themselves as being a guy trapped in a girl's body, a girl trapped in a guy's body, a halfway cross of feminine and masculine traits, feel like both or neither, have strong sexual urges or none whatsoever, be attracted to their own gender/sex, another gender/sex, to other species, to dirt, to bottles, to the hole in the fence, to a goddamn body pillow or trampoline. [b]All of these are perfectly valid and make perfect sense in the face of gender, which is [u]psychological and sociological[/u][/b]. In the face of the physical sex, no, it makes no sense, but nobody is talking about the physical sex when they talk about sexual identity. They're talking about the psychological and sociological aspects. There. Science. N' shit. [center][img]http://www.spacefoundation.org/sites/default/files/resize/styles/large/public/content_images/science_scientificmethod-360x209.gif[/img][/center]