Giro girotondo... con il sesso è bello il mondo(1975)

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.