Contraceptive Revolution[2] is a 1967 Japanese pink film directed by Masao Adachi for Kōji Wakamatsu's production studio.

[3] The insane gynaecologist, Dr. Marukido Sadao (Marquis de Sade), theorizes that a woman is unable to become pregnant if she is writhing in intense pain during intercourse.

He sets about testing this new method of birth control by torturing women during sex.

[7] Adachi used the character of the crazy gynaecologist, Marukido Sadao—a Japanese pun on "Marquis de Sade"—in his first pink film, Abortion (1966).

The review warns off viewers who are not comfortable with sadism as entertainment, in the style of many pink films.