From my Xennial experience, some time in the 00s. Maybe because the wide spread (heh) availability of internet porn, but I don’t really know. 90s were bushy. 00s was a transitional era and 10s and onwards are bald eagles everywhere.

(Personally I don’t enjoy shaving my parts, I don’t enjoy having shaved parts and I prefer lady parts with some trimmed carpeting rather than both desert dunes or wild djungles.)