How many movies have Masumi Jun and Mitsuyoshi Hikawa collaborated on?

They have worked on 4 movies together! Their first movie together was Enka Jôshikô: Kizudarake no Kaben (1973) while their highest rated movie together was Joshi daisei: Sex kaki seminar (1973). They have not worked together since Secret of the College Girls: Part-Time Sex Pros (1974).