The MPAA Film Rating History by JamesMoulton1988 on DeviantArt

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1970's X Rating Screen by GrayLord791 on DeviantArt

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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

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