The results of a psychological examination of 22 male patients which requested a penile prosthesis implantation are reported. The mean age was 47 years and the intelligence score of the patients was higher than the normal value. In a personal self-judgement they described oneself as stable, minimally neurotic and rather introverted personality. The test results were complicated by a high lie score. A great difference between the self-judgement and the ideal was established. The sexual anamnesis of the most patients was not striking out of the erectile dysfunction.