Midnight Cowboy at 50: How the Dustin Hoffman and Jon Voight flim defied an X Rating to win the Best Picture Oscar

Movies get a ratings system – Dan The Man Trivia

Adult rating, Rating System Wiki

What Happened to the X Rating? AfterPiece! Zine — AfterPiece! Zine

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

History

Every Major Movie That Got Slapped With An X Rating

On this Day in Movie History, November 1, 1968: MPAA Film Rating System Becomes Effective – Michigan Movie Magazine

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

Stanley Kubrick on X: Welly well well well A Clockwork Orange was released in the US #OnThisDay, 1972. Having been awarded an X rating in its original release, Kubrick replaced around 30

Why Iza feels original X rating gave her film 'Bliss' a boost