The Harrad Experiment(1973)

Harrad College was created as an experiment in pre-marital sex, which is overseen by Professor Philip Tenhausen and his wife Margaret. The school pairs male and female students for a month, who are then free to change partners once a month if they choose to do so. Shy Sheila is initially paired with a cocky boy named Stanley, and the outgoing and sexy Beth is matched up with an awkward boy named Harry. These seemingly unfortunate pairings create tension and jealousy among the students, whose reactions are discussed in group sessions led by the professor and his wife.