How many movies have Felicitas Peters and Joachim Hackethal acted in together?

They have worked on 4 movies together! Their first movie together was Hausfrauen-Report 2 (1971) while their highest rated movie together was Urlaubsgrüße aus dem Unterhöschen (1973). They have not worked together since Hausfrauen-Report 6: Warum gehen Frauen fremd? (1977). They are most known for their comedy films together.