R for some scenes of blood and language but in my opinion lost boys isn't that bad also the blood is so fake.
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nooob
Probably the graphic violence and bad language.
The lost boys, the tribe, the thirst.
There is some mild nudity at the beginning of the film. A scene when the two brothers are showering, it shows their posteriors. There is no other nudity during the movie; though it does show some near nudity during one scene where a character named "Gorgeous George" is wearing a speedo.
The original film was rated R.