I always assumed gross stuff included things like gore, blood, and sundry disgusting things of the ilk; with research falling under "nudity". Plenty of researchographic stories come from the blf, including 3 of mine I made as parodies of fan fiction.
there's a procrastination megathread, a furry megathread, and a my little pony megathread
that rule doesn't seem to work exactly as you think it does
You forgot the nintendo megathread.