Case 107. _Contrary Sexual Instinct with Sexual Satisfaction in Hetero-Sexual Intercourse._—Mr. Z., aged 36, Hollander, consulted me, in 1888, on account of an anomaly of his sexual feelings, which had become a matter of anxiety to him in connection with an intended marriage. Patient’s father was neuropathic, and suffered with nightmare and night-terrors. Grandfather was mentally unsound; father’s brother an idiot. Patient’s mother and her family were healthy and normal mentally. The patient had four sisters and one brother, the latter being subject to moral insanity. Three sisters are healthy, and living happy married lives. As a child, the patient was weak, nervous, and subject to night-terrors, like his father; but he never had any severe sickness except coxitis, as a result of which he limps slightly. Sexual impulses were manifested early. At eight, without any teaching, he began to masturbate. From his fourteenth year, ejaculation. He was mentally well endowed, and his principal interest was in art and literature. He was always weak muscularly, and had no inclination for boyish sports and later for manly occupations. He had a certain interest for female _toilettes_, ornaments, and occupations. From the time of puberty the patient noticed in himself an inexplicable inclination toward male persons. Youths of the lowest classes were especially attractive to him. Cavalrymen especially excited his interest. He experienced a lustful desire to press himself against such individuals from behind. Occasionally, in crowds, it was possible for him to do this; and in such an event an intense feeling of pleasure passed over him. After his twenty-second year, on such occasions, he now and then had an ejaculation. From that time ejaculation occurred when a sympathetic man laid his hand on the patient’s thigh. He was now in great anxiety lest he might sometime assault a man sexually. People of the lower classes, wearing tight, brown trousers, were especially dangerous for him. His greatest pleasure would be: to embrace such a man and press himself on him; but, unfortunately, the morality of his country did not allow such a thing. Pederasty seemed disgusting to him. It gave him great pleasure to gain a sight of the genitals of males. He was always compelled to look at the genitals of every man he met. In circuses, theatres, etc., only male performers interested him. Patient has never noticed any inclination for women. He does not avoid them, even dances with them on occasion, but he never feels the slightest sensual excitation under such circumstances. At the age of twenty-eight the patient was neurasthenic as a result of his excessive masturbation.