The authors have described three cases of voyeurism. They could state the following with regard to the psychopathological connections, the effect of the consumption of alcohol and the question of sanity: 1. In two cases, the sexual drive anomaly remained permanently hidden in the conduct of life. One case was an episodical depression associated with voyeurism and exhibitionism. 2. The effect of the alcohol has not only promoted the occurrence of the abnormal sexual drive but also caused an aggressiveness and dangerous incautiousness. 3. The soundness of mind was in no case restricted.