This paper aims to discuss perversion, its implications in the clinical setting, and some of the key concepts around it. First, the etymology of the words “perversion”, “structure”, and “organization” is analyzed. Next follows a discussion on the sexual organization of instincts - from the Unconscious to the Oedipus complex in Freud and Lacan - setting the ground for a disavowal-based theory of perversion. An instructive approach has been chosen so as better to organize the various points presented.