Sex Jack

Sex Jack (性賊), released in 1970, is a film directed by Japanese filmmaker Kōji Wakamatsu.

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.