A female psychologist interviews four men and four women about their sexual desires and falls. They discuss their different problems in a psychological session. Topics include: masturbation, incest, group sex, swinging and homosexuality. Her diagnosis is simplistic and inexorable; a few examples: a secretary masturbates without becoming blind; a young voyeur man has the urge to swallow a big sausage after viewing a nude photo of a meaty lady; a woman marries a man but her cuckolded husband makes her have sex with his father and brother and all his friends. Fortunately, there is a gnome-like left-wing intellectual in the company, who claims that the psychologist is not without compulsive neurosis either - and she finds satisfaction in that. Through the exchange, the women and men now want to get to the bottom of it and start a group sex orgy.