How many movies have Kōichi Saitō and Naoto Yoshimoto collaborated on?

They have worked on 4 movies together! Their first movie together was Group Molesters: Peeping on the Housewife (1991) while their highest rated movie together was Under the Carp Banner (1992). They have not worked together since Bliss of Young Sex: Good Afternoon, Clitoris (1995).