For example, how much traditionally gendered behavior do feral children display? That’s biological gender, right there. They have the same hormones any of the rest of us do, minus all the socialization.
By itself it only proves that hormones are not sufficient and socialization is necessary, not that hormones are not necessary and socialization is sufficient.
IIRC many people born with ambiguous external genitalia, accidentally surgically assigned to the sex other than their gonadal one, and raised as the corresponding gender tend to become transgender (i.e. to identify with the gender corresponding to their gonadal sex rather than their assigned sex) by their late teens.
Also, by quickly glancing at the Wikipedia article ISTM that chemical castration does work—though to be sure I would have to see double-blind trials, which for obvious reasons would be problematic (to say the least) to perform.
By itself it only proves that hormones are not sufficient and socialization is necessary, not that hormones are not necessary and socialization is sufficient.
IIRC many people born with ambiguous external genitalia, accidentally surgically assigned to the sex other than their gonadal one, and raised as the corresponding gender tend to become transgender (i.e. to identify with the gender corresponding to their gonadal sex rather than their assigned sex) by their late teens.
Also, by quickly glancing at the Wikipedia article ISTM that chemical castration does work—though to be sure I would have to see double-blind trials, which for obvious reasons would be problematic (to say the least) to perform.