So, how many lemmynsfw.com communities have you blocked?
I just reached 112 myself.
I'm very much awaiting a time when users can block specific instances. I still don't want to check the option to hide NSFW content, because I do want to see NSFW content that may show up on non-porn communities. Just not really interested in seeing so much porn in All.
You can check on your settings page, btw, in the Blocks tab - count quickly with Ctrl+F.
It consistently shows up on my front page, which is only 20 posts. If you're not seeing it you may not be on All, or you may have the option to hide NSFW content checked.