Early severe libidinal frustration and the consequent overpowering aggression played a crucial role in the genesis of this fully developed pedophiliac perversion. Primitive introjection and the projection mechanisms, processes normally employed during the early periods of ego development, were later utilized to achieve satisfaction of vital love needs and to neutralize aggressive impulses. These mechanisms further allowed for the successful alleviation of anxiety. In the patient described, a splitting of the ego and of the object were conditions necessary for the enactment of the pedophiliac perversion. The perversion succeeded in interrupting the progression toward a psychosis and was a prophylactic device.