File:X MPAA.png - Wikipedia

Movies get a ratings system – Dan The Man Trivia

Adult rating, Rating System Wiki

X 18+ - Wikidata

What makes a movie X rated? - Quora

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 —

Best X-Rated Movies: Adult Movies That Are Actually Good - Thrillist

IPX Waterproof Rating Guide – Hypergear US

Saw X' Is The Most Well-Reviewed Saw Movie Ever, By A Huge Margin

DREAMS ARE WHAT LE CINEMA IS FOR: LAST SUMMER 1969

X-Rated Movies: 28 Provocative Films That Challenged the MPAA – IndieWire