Based on the 1966 novel of the same name by Robert Rimmer, this film deals with the concept of free love during the height of the sexual revolution, which took place in the United States during the late 1960s and early 1970s.

The movie stars James Whitmore and Tippi Hedren as the married couple who run the school, and includes a young Don Johnson as one of the students who tries to go beyond the rules.

Throughout the film, the students participate in various activities and discussions led by Professor Tenhausen, aimed at breaking down societal taboos and encouraging personal growth.

Appearing in uncredited roles are Ted Cassidy as a diner patron, Melanie Griffith and Gregory Harrison as students, Melody Patterson as Jeannie, Dennis F. Stevens as a heckler at the Ice House, and George Memmoli, Bill Saluga, and Fred Willard as Ace Trucking Company employees.

"[5] He added, "The Harrad Experiment can probably be summed up by its opening and closing sequences — it begins with one of the girls wandering around the new campus and hugging a tree, and ends with the two couples whose relationships are the heart of the film clasping hands, repeating some inane contact exercise, and finally falling into a four-way embrace."