How many movies have Horst Sieger and Lutz Ziervogel collaborated on?

They have worked on 3 movies together! Their first movie together was Der Sexbaron von St. Pauli (1980) while their highest rated movie together was Verbotene Spiele auf der Schulbank (1980). They have not worked together since Das Sexabitur 2 (1981). They are most known for their comedy films together.