I once wrote an essay and was very tempted to rate it 18+, mainly because it was rather complicated and I just knew younger folks would not really understand me (the older ones didn't either most of the time...). I mean, my warning was "I read Judith Butler".
I, unlike others, wouldn't like to label the first category "general" or "standard", however, because to me, "normal" stories contain at least a bit of potentially offensive content.