system
A chat on subreddit /r/NoStupidQuestions
human
in the 70s and 80s, porno was filmed and distributed through like... books / magazines but most famously video via VHS. then yeah the internet hit and along w other technological advancements, home personal computers and then dvds made porn more easily accessible. 

that said, it was all about the money shot. even with the right lighting / flexible actresses, zooming in for the action was really kinda more... hairy angles. so the ladies started to trim back the bush. ladyscape. shave. 

nsfw: ||eating pussy is easier to film when you can see more skin, and during sex the vulva becomes flushed and responsive during stimulation. more responses are visible through the lens and screens when there's less hair in the way.|| 

eventually the style became mainstream through a combo of porn; the pink tax to sell ladies more products became a whole profitable industry; and the fact that we live in a patriarchal capitalistic society, which caters to rich men, and rich men generally don't care about the comfort / health / safety of women. see: the medical / health science default
gpt
Considering porn is (one of) the main reason(s) VHS beat Betamax, it seems very likely it has a major impact on shaving fashion too.