That bot exclusively posts communities that are trending on this instance and doesn't really answer OP's question.
Lemmyf.uk - I generally have only seen consistent nsfw content from the !sexmemes@lemmyf.uk and !freakychicks@lemmyf.uk (the latter community kind of died in favor of c/gonewild here though)
Pornlemmy was competing with lemmynsfw during the Reddit exodus, but failed to get a decent user base and it looks like they shut the instance down as far as I can tell.
Yiffit.net - An instance devoted to furry NSFW. The active users are kind of small bunch at this point and the sole admin kind of disappeared because of life circumstances, but it's still online.