How many movies have Tadashi Watanabe and Tadashi Yoyogi collaborated on?

They have worked on 11 movies together! Their first movie together was Dokyumento poruno: Zoku hatsujô-zoku o hagu (1973) while their highest rated movie together was Document porno: Chikan o hagu (1977). They have not worked together since OL chijo shimai: Uwa-kuchibiru shita-kuchibiru (1978).