It's always been that way. Probably going all the way back to the very first time a caveman backhanded a cavewoman for daring to form an opinion that goes against his.
The only time woman/female isn't used as a descriptive is when we're talking about anything that has always been commonly accepted as a "woman's place" throughout the ages. ie: Teacher, nurse, secretary, maid, housekeeper, cook, prostitute. You'll never see any of those being used as "girl nurse", "female teacher", "woman prostitute". Anything beyond those handful of professions that women were allowed to do outside of the home had to then be separated from their male counterparts so as to add emphasis on the 'oddness' of a female being a lawyer, a doctor, a politician.
Why is a female thesbian known as an "actress" instead of just an "actor"? Why must society invent a new word to separate one from the other? Waiter/waitress? Host/hostess? Hero/heroine? What the hell is the difference? They're both doing the exact same job, are they not?
You'd think in today's world these divisive gender descriptives would finally become redundant, but apparently society is still having great difficulty letting go of its male dominion and thus, still can't quite fully grasp that a pilot is a pilot is a pilot, no matter if said pilot stands or sits to pee.
Some day in a future world, a long long long long long time from now.... A lawyer that has a vagina will just simply be a known as a "lawyer", a doctor that has a uterus will just simply be a known as a "doctor", a hero that has a pair of boobs will just simply be known as a "hero". And a nurse that has a penis will just simply be known as a "nurse".
But until then, society insists that we all continue to be pigeon-holed based on whether we have an outie or an innie, whether we're the pitcher or the catcher. With the former still being viewed as dominating over the latter. "Stop being such a (weak) pussy and grow a pair of (strong) balls."
