House on the Edge of the Park (1980) – Ruggero Deodato.

Is House on the Edge of the Park a moral film? I think not. It hungrily wants its cake and eat it too. The exploited proletariat vs dilettantish bourgeoisie dynamic is merely a cynical ruse for a memorably brutal catharsis which suggests that privileged, equally vapid wasps enjoy the same capacity for fetishized cruelty as the prodigiously psychotic rapist Alex (David Hess). House on the edge of the Park is a perverse, darkly fascinating, gleefully sadistic exploitation gut-puncher, yet it is so consummately made, you can almost forgive director Deodato for being so bloody nasty! A hard film to love, but its ability to disturb remains undiminished, it must also be noted that David Hess exposes a pair of demonstratively magnificent buttocks.