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In pornword net other words, every fic on this site is tagged with one of the three).
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Labeling textual sex as scene anal 3d explicit or not is always a dicey matter, and one of those things people get into endless arguments about, particularly when they're trying to apply the usual movie ratings to fic (something you notice I sidestepped.) For the record, my general.
There's everything from snogging to heavy petting to abstract metaphors to glossed-over "on-screen" sex. But the old MPAA rating system needless girls hamtai tends to break down when applied to fiction, and most other subdivisions I've seen are awkward in the extreme.