Behind the Green Door is a 1972 American feature-length
pornographic film, widely considered one of the genre's "classic" pictures and one of the films that ushered in
The Golden Age of Porn. Featuring
Marilyn Chambers, who became a mainstream celebrity, it was one of the first hardcore films widely released in the United States and the first feature-length film directed by the
Mitchell brothers. It was adapted from an anonymous
short story of the same title, which was circulated by means of numerous
carbon copies. The story's title makes reference to the 1956 hit song "
Green Door". Though the main focus of the film, Chambers does not have a single word of dialogue in the entire film. The film is possibly the first U.S. feature-length
hardcore film to include an
interracial sex scene.