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

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

X-Men: Days Of Future Past Includes Nudity According To MPAA Rating

Saw X - Rotten Tomatoes

The first American film to receive an X rating

RetroNewsNow on X: 🎬On November 1, 1968, the Motion Picture Association of America's film rating system was officially introduced with the ratings G, M, R & X / X

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

The X-Files' Ratings Top 20 Million in 3-Day Viewing

Infinity Pool' and the Battle for an R Rating - The New York Times

X Launches Three Tiers of Premium Subscriptions

original version of the movie ratings poster before the X rating was changed to NC-17 : r/RedditDayOf