What do the movie ratings mean? ...

G General Audiences: All ages admitted.
PG Parental Guidance Suggested: Some material may not be suitable for children.
PG-13 Parents Strongly Cautioned: Some material may be inappropriate for children under 13.
R Restricted: Under 17 requires accompanying parent or adult guardian.
NC-17 No One 17 and Under Admitted

Wikipedia article: "MPAA film rating system"

How is the NC-17 rating determined? More information on movie ratings is available at the Motion Picture Association of America.

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NC-17 is a registered trademark of MPAA.

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