For the uninitiated, generally NSFW is for sexual contents and NSFL is for gory contents. People may want to see one but not see the other at any time for any reason. I have seen this feature requested over the years in Reddit but it never happens. Maybe now some instance can finally implement it?
Going back to reddit r/WTF often had posts with either gore or nudity (or both), as an example.
That’s a good example.
I think most instances doesn’t allow gore though.