How many movies have Teiji Inayama and Toshiatsu Kôzuma collaborated on?

They have worked on 8 movies together! Their first movie together was Couple (Secret) Sex Life: Wife is Melting (1997) while their highest rated movie together was Gibo no onanii: Hatsujô roshutsu (1997). They have not worked together since Bullying Housewives: Lewd Heaven (2000). They are most known for their drama films together.