How many movies have Eva Berthold 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 Schoolgirl Report Part 10: Every Girl Starts Sometime... (1976). They have not worked together since Schoolgirl Report Part 12: If Mom Only Knew... (1978). They are most known for their drama films together.