1970's X Rating Screen by GrayLord791 on DeviantArt

X (MPAA), Rating System Wiki

cinema history - Why would a movie that appears pornographic via it's rating (X) receive an Academy Award? - Movies & TV Stack Exchange

MPAA Rating Bumper Rated X Remake (1968-1970) by TheAnthonyCorp on DeviantArt

What happened to the X Rating?

File:MPAA X RATING (block).svg - Wikipedia

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

X (BBFC), Rating System Wiki

RetroNewsNow on X: 🎬In November 1968, the Motion Picture Association of America's film rating system was officially introduced with the ratings G, M, R and X / X

6th Season of Ryoko Yonekura's “Doctor-X” starts off to huge ratings

Is 'X-Rated: The Greatest Adult Movies of All Time' on Netflix in Australia? Where to Watch the Documentary - New On Netflix Australia & New Zealand