MPAA Defines NC-17: No One 17 and Under Admitted. Signifies that the rating board believes that most American parents would feel that the film is patently adult and that children age 17 and under should not be admitted to it. The film may contain explicit sex scenes, an accumulation of sexually-oriented language, and/or scenes of excessive violence. The NC-17 designation does not, however, signify that the rated film is obscene or pornographic in terms of sex, language or violence.