Messenger girls using mopeds go around having sex with clients (and passers-by), with their boss (Alban Ceray) and with each other. Cathy Stewart seems to be the ring leader, punishing the boss for taking advantage of the office girl (Patricia Santos), having sex with a surgeon in a hospital lift and with a man walking a dog (Gabriel Pontello) in a stairwell. Her gang consists of Marilyn Jess, Marianne Aubert and Christine Black.
The plot centers on "tossing". Tossing is a trend Cathy Stewart picked up during her US holiday. You look someone in the eyes, give him or her a sign, and if he or she responds, you fuck – without speaking. Because they didn’t speak, Cathy doesn’t know the name of the surgeon. So she and the other girls are searching for this man.