MPAA Rating Bumper Rated X Remake (1970-1971) by TheAnthonyCorp on DeviantArt

MPAA X Rating, Scary Logos Wiki

X 18+ - Wikidata

File:X rating symbol.png - Wikimedia Commons

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

getTV - The movie ratings system began 51 years ago today — Nov 1, 1968. The first ratings were: G — General Audiences M — Mature (became PG) R — Restricted X —

CLOCKWORK ORANGE' TO GET AN 'R' RATING - The New York Times

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

Nymphomaniac librarian in 'The Wicker Man' – REEL LIBRARIANS

Midnight Cowboy' Rode to Success Despite Its X Rating – The Hollywood Reporter

Project X Parents Guide