As regards his sexual sensibilities in general, he is by no means indifferent to members of the opposite sex. He gladly seeks social intercourse with females, and likes to kiss them; but he does not experience any definite sexual impulse towards them, such as might culminate in sexual intercourse. Three times he has had actual intercourse, but on each occasion he has been able to effect erection and ejaculation only by means of all kinds of artificial stimulation. It is a noteworthy fact that when he was fifteen or sixteen years of age he became intimate with the members of a homosexual circle, and only by considerable effort was he able to free himself from these associations. In autobiographical literature we from time to time come across accounts of such perverse modes of sexual sensibility. Ulrich von Lichtenstein, in whom masochistic inclinations were unmistakably present, relates that when he was barely twelve years of age he became the devoted slave of a grown woman; and he describes his sentiments, at this early age and subsequently, towards this woman, who was well born, good and beautiful, chaste in mind and body, and in every respect virtuous. Well known, too, is the case of Rousseau, of which I shall have to speak again later; this writer traces his masochistic perversion back to the seventh year of his life. I may allude also to Retif de la Bretonne, who was born in 1734, and certainly experienced sexual sentiments in very early childhood. In his _Monsieur Nicolas_,[58] which must be regarded as an autobiographical work, Retif relates the beginnings, in the years 1743-44, of his fetichistic fondness (which endured throughout his life) for women's feet and women's shoes. In purely fictional works, analogous cases are also described. Thus, in his _Pour une Nuit d'Amour_, Zola depicts a sadistic-masochistic relationship between two children:-- "From earliest childhood Therese von Morsanne used Colombel as the scapegoat and the sport of her caprices. He was about six months older than she. Therese was a dreadful child. Not that she was wild and uncontrolled, like the ordinary unruly child; on the contrary, she was extraordinarily serious, with the outward aspect of a well-brought-up young lady. But she had most remarkable whims and caprices, When she was alone, she would from time to time utter inarticulate cries or angry howls.