How many movies have Katsumasa Naoi and Shinsaku Himeda collaborated on?

They have worked on 10 movies together! Their first movie together was Ichijo's Wet Lust (1972) while their highest rated movie together was Wet Lust: 21 Strippers (1974). They have not worked together since Painful Bliss: Final Twist (1977). They are most known for their drama films together.