I've sorted by both active and hot and I'll see numerous posts from various communities from lemmynsfw. They're marked as NSFW so it doesn't really bother me but it is surprising since that's not something that ever happened on Reddit so it was unexpected.
Edit: after leaving this post to continue browsing, I came across three more NSFW posts within a few minutes.
Yeah you used to see a few gonewild posts a day in /all. Then they made popular which I think was supposed to be all without the porn. Then they just removed the porn from all.
Yeah, I'm the only user in my instance so they makes sense. But I also have an account on lemmy.world and browse it's all. I hadn't really been seeing much until today I got hit by a whole bunch earlier. Oh well