Till Sex Do Us Part(1971)

Original title: Troll

This Swedish sex-comedy/drama explores the complications in the relationship of a couple who believe that if they make love to each other, they will die. They neck and are physically affectionate in public as well as in private, but have a big taboo against sexual consummation. Their situation drives them to distraction, and they unsuccessfully seek various extramarital outlets for their frustrations.