MPAA X18 Rated Logo by JamesMoulton1988 on DeviantArt

Basics of Fire-Rated Type X or C Drywall

Whatever Happened to the X Rating?

The Best X-Rated Movies in History

cinema history - Why would a movie that appears pornographic via it's rating (X) receive an Academy Award? - Movies & TV Stack Exchange

Movie Poster of the Week: Rated X at the Quad on Notebook

CLOCKWORK ORANGE, Stanley Kubrick, X Rated Ratings Box Original Movie Theater Poster - Original Vintage Movie Posters

Fritz the Cat (1972) JPK's Adventures in Cinema

This Film Is Not Yet Rated (Movie 2006): MPAA Gets an 'F

The Best X-Rated and NC-17-Rated Movies in History

Fast X MPA Rating Revealed for Penultimate Fast & Furious Movie