A peep show, peepshow, or, a peep booth is a presentation of a live sex show or pornographic film which is viewed through a viewing slot.
Several historical media provided voyeuristic entertainment through hidden erotic imagery. Before the development of the cinema in 1895, motion pictures were presented in peep boxes, such as the kinetoscope and the mutoscope. These remained relatively popular for erotic and pornographic films, such as What the Butler Saw.