X - MPAA Movie Rating for Adults Only by

A Brief History of the Movie Rating System

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these people need to understand MPAA ratings : r/insanepeoplefacebook

Rating Bumper - Rated X (Adults Only)

MPAA Rating System

The movie ratings G, PG, PG-13, and R are obvious in why they are different. But what are the difference between NC-17, X, and Unrated? - Quora

A Brief History of the X Rating

Parent reviews for X

13 Films That Broke the MPA Rating System

Blonde' Is the First NC-17 Netflix Movie (and Probably the Last) - The Ringer

Motion Picture Association, Rating System Wiki