File:X MPAA.png - Wikipedia

MPAA X Rating, Scary Logos Wiki

The History of The First X-Rated Movie - Rare

Adult rating, Rating System Wiki

Oscar's X-Rated Past! The 13 Academy Award Nominations For X-Rated Films With An Awards Edge!

Watch Quentin Tarantino Fave The Street Fighter, The First Movie To Get an X -Rating for Violence (NSFW)

History

MPAA X Rating Band (1968) [FTD-0199]

MOVIE 'SCARFACE' RECEIVES X RATING - The New York Times

Rating X: Twitter's chaotic year under Elon Musk's shock treatment

What is the difference between the movie ratings R (17+), X (19+) and XXX (21+) other than age, and what do they mean? - Quora