Krafft-Ebing assumes that males who have been born with neuropathic ailments of an indefinite kind will masturbate, destroy their virility, and then embark upon a course of vice which offers incalculable dangers, inconceivable difficulties, and inexpressible repugnances. That is the theory. But whence, if not from some overwhelming appetite, do the demoralised victims of self-abuse derive courage for facing the obstacles which a career of sexual inversion carries with it in our civilisation? One would have thought that such people, if they could not approach a prostitute in a brothel, would have been unable to solicit a healthy man upon the streets. The theory seems to be constructed in order to elude the fact that the persons designated are driven by a natural impulse into paths far more beset with difficulties than those of normal libertines. Krafft-Ebing gives the details of five cases of "acquired" sexual inversion. Three of these were the children of afflicted parents. One had no morbid strain in his ancestry, except pulmonary consumption. The fifth sprang from a strong father and a healthy mother. Masturbation entered into the history of all. It must be observed, in criticising Krafft-Ebing's theory, that it is so constructed as to render controversy almost impossible. If we point out that a large percentage of males who practise onanism in their adolescence do not acquire sexual inversion, he will answer that these were not tainted with hereditary disease. The autobiographies of onanists and passionate woman-lovers (J. J. Rousseau, for example, who evinced a perfect horror of homosexual indulgence, and J. J. Bouchard, whose disgusting excentricities were directed toward females even in the period of his total impotence) will be dismissed with the remark that the ancestors of these writers must have shown a clean record. It is difficult to square Krafft-Ebing's theory with the phenomena presented by schools, both public and private, in all parts of Europe. In these institutions not only is masturbation practised to a formidable extent, but it is also everywhere connected with some form of sexual inversion, either passionately Platonic or grossly sensual. Nevertheless, we know that few of the boys addicted to these practices remain abnormal after they have begun to frequent women. The same may be said about convict establishments, military prisons, and the like.[23] With such a body of facts staring us in the face, it cannot be contended that "only tainted individuals are capable of homosexual feelings." Where females are absent or forbidden, males turn for sexual gratification to males. And in certain conditions of society sexual inversion may become permanently established, recognised, all but universal. It would be absurd to maintain that all the boy-lovers of ancient Greece owed their instincts to hereditary neuropathy complicated with onanism.