How many movies have Kazuhiko Ban and Nobumasa Mizunoo collaborated on?

They have worked on 4 movies together! Their first movie together was Nympho Diver: G-String Festival (1981) while their highest rated movie together was I Love It From Behind! (1981). They have not worked together since Kairaku Onsenkyô: Nyotaiburo (1981). They are most known for their comedy films together.