It is the year 2010 and, due to extreme overpopulation, casual sexual activity has been outlawed. An innocent young girl named Little Red Riding Hood makes her way across the countryside encountering all manner of people exhibiting sexual perversion from both sides of the law. As she witnesses these lewd acts, she dreams of a time when these sexual unions weren't forbidden and people were free to act on their impulses.

At the end of World War II, shallow, self-centered Mara is the prettiest girl in her small Italian village; Bebo is a Communist partisan who is finding it difficult to adjust to the dull banalities of life in peacetime. When Mara’s father, a passionate Communist, declares that his daughter will marry the returning hero, her reactions range from joy to bitter resentment.