How many movies have Shuji Sasano and Tsutomu Yamada collaborated on?

They have worked on 4 movies together! Their first movie together was Young sex: Rankô shori (1972) while their highest rated movie together was College Girl: 3 Days, 3 Nights, All Sweaty (1979). They have not worked together since College Girl: 3 Days, 3 Nights, All Sweaty (1979).