How many movies have Helmut Früchtenicht and Wolf C. Hartwig collaborated on?

They have worked on 3 movies together! Their first movie together was Sex in the Office (1971) while their highest rated movie together was Swinging Wives (1971). They have not worked together since Schoolgirl Report Part 6: What Parents Would Gladly Hush Up (1973). They are most known for their drama films together.