How many movies have Gerd Arnau and Gert Wilden collaborated on?

They have worked on 3 movies together! Their first movie together was Schoolgirl Report Part 3: What Parents Find Unthinkable (1972) and was their highest rated movie together. They have not worked together since Schoolgirl Report Part 6: What Parents Would Gladly Hush Up (1973). They are most known for their comedy films together.