MPAA X18 Rated Logo by JamesMoulton1988 on DeviantArt

X (MPAA), Rating System Wiki

X rating - Wikipedia

MPAA Rating Bumper Rated X Remake (1970-1971) by TheAnthonyCorp on DeviantArt

A Brief History of the X Rating

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

Nicole on X: The Best and Worst Rated Episodes of The X-Files

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Superstar X-Factor Players on Madden 23

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The MPAA Film Rating History by JamesMoulton1988 on DeviantArt