Gen-X guy with possibly too much interest in the subject.
Shaving it bald for women started to become normal about 15 years ago. Trimming it was more common then, and going back to end of the 1980s, shaving was a rare and weird fetish in the western world.
As for why, I’d say it’s because porn normalized it - and porn did it because as mainstream content became more explicit, shaved pubes were both easier to keep clean for the actresses, and (more importantly) showed more.
I find it funny that now that it’s become mainstream, hair is becoming a growing fetish.
As an aside, since pubic hair is a sign of sexual maturity, some of the generations that grew up with hair down there have a subconscious connection between bald and sexually immature, i.e. children.
No, the show with the same name had nothing to do with the book or movie.