/kbin

Part of the trouble is likely to be posts that aren't marked as nsfw. It'll gladly show you things from nsfw magazines and instances with adult content hidden if the actual post isn't marked nsfw.

If you notice the instance name looks like it's nothing but nfsw content (such as redgifs.com, files.catbox.moe, & lemmynsfw.com), you could just block that instance. When you view the post or instance, there's a block button next to the subscribe button. Hit that, and you won't see posts from that instance any more. Though keep in mind that if it isn't a nfsw instance, you might be blocking stuff you want to see...

You can also try just reporting the post, as some places are going to be trying to be on top of that sort of thing.