Sex and cinema have a complicated relationship, and sex-film director Joe Sarno understood this better than most. In the U.S., nudity and simulated sex are generally understood as appeals to prurience–and, often, commercially exploitative gestures–but they can be more than that. They have to be, if they are part of a serious film. A filmed sex scene may be arousing, sure, but it’s also a vehicle to express character. Depending on performance and visual approach, screen sex can demonstrate frustration and restlessness as easily as romantic contentment; an actor can convey self-loathing instead of, or in addition to, satisfaction. That dicey territory–the sex film that turns you on while treating the action as problematic–was Sarno’s turf.