That’s basically my hypothesis lol. Additionally idk if it’s just
Only now, no longer the world hegemon they were from ~1800-1945 and having to be seen to uphold certain values, are they finally able to indulge (safely and legally of course) their various sexual fantasies.
The advance of technology as well plays a part I think as well, as does the accompanying proliferation of pornography. Had the internet (and the various porn platforms) existed in a similar fashion to now but in the Victorian or Edwardian-period, I wouldn’t be surprised if the content was broadly similar.