Бархатный край / The velvet edge (1976)

"Sergei has organized a group sex party,during which one woman is hooked up to a thrusting vibrator and another experiences anal sex against her will. Sergei tells the story of his grandfather in the 1930s and what amounts to two Bonnies and two Clydes who discover each other in a hold up and merge forces. In the process. Though they are temporarily enjoying an idyilic love life in the back woods. But one of them irritates a Mexican who shoots up the guys and beats and rapes the females.