Japanese movie from the early 1970's where a guy beat his dick against a block of wood.

A sendup of the stereotypical Japanese family: dad is a salaryman jerk, unable to relate to anyone; mom is a hopeless housewife; the older son is a moderate academic success; but the younger son is a rebellious goof-off for whom a tutor must be hired. The tutor, played by the prototypical bad boy actor Matsuda Yusaku, proceeds to blow the entire family apart.

Yoshimoto Koya becomes a tutor to a student, Numata Shigeyuki, an underachiever on the verge of dropping out of middle school. Expecting immediate results, Shigeyuki’s father makes a deal with Koya that if he could make Shigeyuki return to school within a week, he would receive a 100,000 yen bonus. Koya accepts the offer, replying that he would only need 5 days to complete the mission but demands that no one should interfere with his methodology in doing so.

Pinku from 1969.

The sexual experiences of self-proclaimed sexualist Tetsu Hashimoto (Shinji Kubo) from 6 years old to 87 years old.

Erotic-drama distributed by Nikkatsu for home video.

Japanese nunsplitation movie from 1998

Abnormal Passion Case: Razor (1978). a.k.a. Eroticism. Directed by Giichi Nishihara

Erotic-drama distributed by Nikkatsu for home video.

Pinku from 1970.

Roman Porno from 1981.