How many movies have Kiyomi Yasuda and Shōichi Ikeda collaborated on?

They have worked on 6 movies together! Their first movie together was Document porno: Joshidaisei ryô maruhi report (1975) while their highest rated movie together was Maruhi yobai: Goke korogashi (1976). They have not worked together since Tōkyō neon chitai: Josei jishin de go shidō itashimasu (1977).