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I've ranted about the evils of movie ratings for fic in the past. Aside from the psychosis that invades the MPAA so that eviscerations onscreen are PG, female nipples are R, and a penis is an automatic NC-17 (because of course nobody under 18 has seen one before, right?), I don't like rating the reader rather than the content. I want fics (and arts and vids) rated by what's inside them, not by who's expected to find that most appealing.

The most common non-MPAA ratings suggested are age-based, which has several problems. ( More rambling about ratings, plus chart. )