How many movies have Haruki Iwata and Takao Nakano collaborated on?

They have worked on 2 movies together! Their first movie together was Extremely Wild Genuine Sex: Night of the Perverts (1990) while their highest rated movie together was Promiscuous Wife's Sexuality: Pleasure Hunting (1992). They have not worked together since Promiscuous Wife's Sexuality: Pleasure Hunting (1992).