Stan K-B [to "...a person mentioned to me Hugh G. Well's short-story "The Door in the Wall..."] To "a certain class of moviegoers, Green Door uniquely points to the classic 1972 film, Behind the Green Door! http://www.imdb.com/title/tt0068260/ My friends tell me it has artistic merits beyond your typical skinflick. Not sure of the idiom’s origin, but it seems to refer to the exotic antics people perform in private, antics you wouldn’t expect from their respectable exterior curtains or doors."

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