Je t\'aime, moi non plus (1976)

Homosexual garbage-truck driver Krassky and his partner Padovan stop at an isolated restaurant near the landfill where they work to drink a beer. They are served by waitress Johnny and she explains that sleazy owner Boris has given her that nickname since she has small breasts and wears her hair short. Her tomboy style attracts Krassky and she has a crush on him. Boris warns her that Krassky is gay, but Johnny dates him. When they go to bed, Krassky fails; however, when he sees her lying on her face, he gets excited and sodomizes her. They start an unusual relationship and Padovan gets jealous.