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Perhaps what we need is a more fine-grained rating system. Instead of making assumptions about what parents will find inappropriate for their kids, the MPAA could put out a report with various things rated on a sliding scale, e.g.
(1 is "best", 9 is "worst")
Movie: Death Force 3000
Language: 8
Violence: 9
Nudity: 5
Sex: 2
Drug Use: 1
... or something like that. Of course it would take up a little more space in the movie ads, but you could shorten it to "L8V9N5S2D1" or something like that, if you had to.
Eh, just a thought.