This essay stresses the intense relationship between the concept of perversion expressed by Pierre Klossowski and the notion of hospitality which the French thinker unfolds in an extraordinary narrative trilogy. This is shown in the impulsive nature of Klossowski’s approach where he investigates Sade’s work and Nietzsche’s posthumous writings. Sade’s apathetic relationship with his victim and Nietzsche’s aimless philosophy typical of the vicious circle are the main sources of the perverse monogamy rendered by the philosopher-writer in his “Laws of Hospitality”.