How many movies have Erwin C. Dietrich and Margrit Siegel collaborated on?

They have worked on 8 movies together! Their first movie together was The Swingin' Stewardesses (1971) while their highest rated movie together was Vacation Temptations (1972). They have not worked together since Heißer Mund auf feuchten Lippen (1975). They are most known for their comedy films together.