Midnight Cowboy - Wikipedia

List of NC-17 rated films - Wikipedia

X rating - Wikipedia

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

Every Major Movie That Got Slapped With An X Rating

On this Day in Movie History, November 1, 1968: MPAA Film Rating System Becomes Effective – Michigan Movie Magazine

Reviewing the NC-17 Film Rating: Clear Guide or an X by a New Name? - The New York Times

Fifty Shades of Grey' will heat up your week

Film Ratings Explained: What Are The Arbitrary Differences Between Film Ratings And Why They Exist - Hollywood Insider

Serbis poster and trailer rated X by MTRCB

Why is 'Blonde' – Netflix's Marilyn Monroe biopic – rated NC-17 instead of TV-MA?