How many movies have Gert Wilden and Ingeborg Steinbach collaborated on?

They have worked on 3 movies together! Their first movie together was Sex Is Not for Virgins (1970) while their highest rated movie together was Schoolgirl Report Part 3: What Parents Find Unthinkable (1972). They have not worked together since The Swinging Co-eds (1972). They are most known for their comedy films together.