Treating perversions makes great demands on psychoanalysts. Transference and countertransference dynamics which are hard to bear are unavoidable. The articles in this volume explore this field based on detailed clinical case studies and new theoretical aspects. The cases describe include those of a coprophagous perversion, the case of a uniform fetishist as well as a perversion of the experiencing of time. The volume begins with a German translation of the classic article by M. Glasser (1979) on the difference between aggression and sadism, published here in German for the first time. Against this backdrop, the authors provide diverse new insights for example into the figure of the perverse father, autistoid perversion, perverse argumentation and into the change in the meaning of the term perversion.