If we use hormonal, or anatomical, or neurological models, we get different mapping, possibly even different numbers of categories, and these models don't have perfect correspondence.
Salivary testosterone levels, for example, can sometimes be higher in some females than some males.
Salivary testosterone levels, for example, can sometimes be higher in some females than some males.
Comments
How many categories do you *want*?
Those models are always simplifications & we have to remind ourselves that when reality appears to disagree, it's not unscientific to discard or revise the model & say "this is not a pipe."
Physics has laws, biology has exceptions.
"This is what we learned in school."
Yes, in middle school. Then some of us went to college.