Between the removal of nsfw from r/all and my browsing Lemmy there seems to have been quite the explosion in AI generated nudity. One of the things I liked about the r/all nsfw was the “discovery” as I might flip through the days latest news. I say that because the images I’ve seen are whatever you horny bastards upvote enough to make a Top list. The AI images look like bad Instagram filters - or maybe filters that are just too good. It’s almost past the uncanny valley, but not quite. As for the skin tone and ethnicity I just assume that’s the bulk of the user base self-selecting.
I will say that my teenage self would have been salivating at these. The older me finds most of them, if not disturbing/offputting for appearing so young, a bit too perfect for my taste. To drop a quote: “the sadder but wiser girl’s the girl for me” these days.