This is because the movie has an intense amount of blood and gore. Other thant that there is no nude scenes, and the storyline is not all that great. The first half hour of the movie is very boring, then the action starts.
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It is rated "R".
It was rated R (in the US).
The movie is rated R.
The reasonJennifer's Body is rated R is because of the sexuality, blood, gore, nudity and frighting scene's is why its rated R.
It's rated 'R' for violence and language.