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

What do movie ratings mean? - Child & Family Development

Rated X (TV Movie 2000) - IMDb

8 Provocative Facts About the X Film Rating

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

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

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X (BBFC), Rating System Wiki

X-Rated Movies at Yerba Buena – Bayflicks

Serbis poster and trailer rated X by MTRCB

3. The Contemporary Movie Rating System in America” in “Sexuality in the movies” on Digital Publishing at Indiana University Press