Sex Jack

Sex Jack, released in 1970, is a film directed by Japanese filmmaker Kōji Wakamatsu. It was written by Masao Adachi.
Wakamatsu expressed that in Sex Jack, he aimed to depict the consistent infiltration of revolutionary movements by government-operated moles.

Plot

In the near future, a small gang of revolutionary students is hidden away by a small-time thief. While they are in hiding, everyone except the thief takes turns engaging in sexual activities with a girl who appears unhappy and perhaps unwilling, having had the misfortune of getting involved with them.