Behind the Green Door was not simply another adult film from the Mitchell brothers' San Francisco operation. Prior to its release, most of their roughly 200 productions had been shown primarily at the O'Farrell Theatre, but this 1972 feature received a nationwide theatrical rollout and became one of the defining successes of the Golden Age of Porn. Its reported production budget was approximately $60,000, while its theatrical receipts exceeded $1 million and its eventual total, including video, surpassed $50 million. The film also became one of the earliest feature-length American hardcore films to reach a substantial mixed-sex audience and is often identified as possibly the first such film to include an interracial sex scene. Marilyn Chambers's sudden celebrity, the Ivory Snow controversy, positive attention from parts of the mainstream press, and even a screening at Cannes transformed it from a local adult-theater attraction into a notorious crossover event. The financial figures and cultural impact are documented rather than an urban legend, although the film's exact place in 'first' claims is necessarily qualified by the source's use of 'possibly.'
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