Keisuke Senda

16-year-old Tachiko (Kimiko Asuka) discovers the true nature of her father's wife, Fumie (Michiko Sakyo), who is after the fortune of the company president, Gozo (Keisuke Senda), and recommends divorce to him, but she is kidnapped and her virginity is stolen by Hayata (Ryoichi Amano) who is colluding with Fumie. After the funeral for her father, who committed suicide out of pity for his daughter, Tachiko disappears.

Koichi is a gigolo who is paid by a madame to seduce and have sex with various women while she and her clients secretly watch. He doesn't like what he's doing, but he needs the money to take care of his seriously ill mother. One day he's given the assignment to seduce a pretty waitress and they wind up falling in love. Koichi tells his madame that is going to quit, but she has other plans for him.

Pinku from 1969.

Two boys set their sites on some vacationing girls in a summer resort town; they place bets on which one of them will score first.