How many movies have Christina Lindberg and Wolf C. Hartwig collaborated on?

They have worked on 3 movies together! Their first movie together was The Swinging Co-eds (1972) while their highest rated movie together was Schoolgirl Report Part 4: What Drives Parents to Despair (1972). They have not worked together since Love in 3-D (1973). They are most known for their comedy films together.