Slaughterhouse-five (1972)

Slaughterhouse-Five is the 1972 film adaptation of Kurt Vonnegut's anti-war novel, following Billy Pilgrim as he slips between the trauma of World War II and a captivity staged on the planet Tralfamadore. Valerie Perrine plays Montana Wildhack, the Earth woman displayed alongside Billy inside a glass enclosure as part of an alien exhibit. That role gives her a full nude scene, filmed with Perrine bare and exposed inside the enclosure set. The site carries 1 clip from the movie, pulled straight from that sequence.