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This French documentary is a valuable window into the so-called Sexual Revolution as it manifested in the U.S. during the pre-AIDS era of the mid-1970s. Drag queens, sex-slave auctions, prostitutes, and sex-workers all have their time before the cameras. Particularly interesting is a discussion held with a male live-sex-show performer in the company of his wife. A few explicitly hardcore moments are shown, and there are numerous simulated sexual encounters in Sex O'Clock, USA.