Oh man I totally agree about the repeating themes. That's true even on the non-porn communities...especially during the gold rush to copy every single subreddit but none of the rules that made them unique
I don't really use Lemmy for porn but I don't mind seeing it since I have NSFW posts blurred. Aside from sexuality/kinks I'm not into, I block a lot of communities with users that post like 20 things at once.