Stanley, Harry, Sheila and Beth, four students from the 'free sex' Harrad College, spend the summer together to meet their families.

The Harrad Experiment (1973) is a comedy drama about a group of college students who participate in a controversial experiment on free love and sexuality. The students explore various aspects of relationships, including group sex, menage-a-trois, and sex therapy. The film explores themes of sexual liberation, promiscuity, and the challenges of navigating complex relationships in a university setting.