I have the Hide Adult Content checkbox selected in my profile settings, but I am still seeing stuff like this in the sidebar as links to Random Magazines / Posts / Threads.
I'm not sure if it technically is a moderation issue where the Magazine, Post, or Thread needs to be marked as NSFW in case the OP didn't do so or something more. It seems like it happens too often to just be where it is simply posts that slip past the mods so that makes me wonder if the NSFW checkbox is broken or just doesn't do anything.
Behold the threadiverse as it has been coined:
https://fedidb.org/current-events/threadiverse
Yes there is a high degree of compatibility between Lemmy and kbin - you'll often see them discussed together for this reason.