It was the first animated feature film to receive an X rating in the United States and the most successful independent animated feature to date.
Censors at the time attempted to give the film an X rating.
From the late 1960s to about the mid-1980s, several mainstream films were released with an X rating such as Midnight Cowboy, Beyond the Valley of the Dolls, A Clockwork Orange, Fritz the Cat, Last Tango in Paris and The Evil Dead.
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Fritz, a film based on a character created by artist and illustrator Robert Crumb, was the first animated movie to receive an X rating in the United States.
The most notable films given an "X" rating were Deep Throat (1972) and The Devil in Miss Jones (1973).