Taiheiyo Eiga
Kōshoku tōmei ningen: onnayu nozoki 1979
An impotent salaryman discovers he can have sexual experiences with unsuspecting women when he becomes an out-of-body ghost.
Chikan-shi: Dote sagashi 1980
Pinku from 1980, distributed by Nikkatsu
College Girl: 3 Days, 3 Nights, All Sweaty 1979
Three female college students all need extra credit in order to graduate. So they convince an assistant professor into helping them with a three day cram course… in immersive sex studies.