The following sites offer information on movie ratings:

Kids-in-Mind.com

About kids-in-mind.com :

Unlike the MPAA, we do not assign a single age-specific and indecipherable rating. Instead we assign each film three category-specific, objective ratings on a scale of 0 to 10, according to quantity and context: one for SEX & NUDITY, one for VIOLENCE & GORE and another for PROFANITY. Since we make no recommendations, either critical or age-specific, we enable concerned adults to determine whether a film is appropriate for them and their children according to their own criteria and values.

 

The Classification and Ratings Administration

 

Screen It

ScreenIt.com offers details telling why any movie was rated the way it was rated, whether due to violence, sexual content, profanity, or drug content. Be warned, though, as each description contains storyline spoilers.