Midnight Cowboy - Wikipedia

Adult rating, Rating System Wiki

The Best X-Rated Movies in History

A History of the X and NC-17 Ratings – The Hollywood Reporter

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

The first American film to receive an X rating

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

X - Rotten Tomatoes

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

Film Ratings Explained: What Are The Arbitrary Differences Between Film Ratings And Why They Exist - Hollywood Insider

Iza Calzado disappointed over x rating on new film, Actress Iza Calzado is disappointed over the X rating given to her new film entitled Bliss, #CNNPHNewsNight www.cnn.ph