I see in such an atavistic tendency the predisposition to homosexuality, common to all neurotics. Perhaps organic changes, such as I have found in more or less pronounced form in most homosexuals also play a certain rôle. Persons of pronounced bisexual type do not necessarily become homosexual, but this does not disprove that the organic condition may be a factor. Here is where I agree with _Hirschfeld’s_ “intermediate sex” theory. But beyond this point our standpoints diverge. The organic factors remain yet to be investigated. We are but at the beginning of our studies of organic bisexuality. The ascertainment of unilateral hermaphroditism, it seems to me, will play a particularly important rôle in future investigations. Already the data obtained through the examination of large groups of persons, for which the World War furnished me an opportunity, impressed me with the fact, that contrary sexual _Anlage_ is to be found particularly often on the left side of the body. (In men this shows itself in the form of unilateral gynecomasty, scant hair growth, asymmetry of the face, the left side being more pronouncedly of feminine type.) The finding of infantile features must also be considered of significance in the diagnosis of an organic predisposition to homosexuality. These interesting facts do not relieve us of the need of establishing the psychogenesis of homosexuality on a sound basis. But the multitude of conditions which may lead to homosexuality admit no hard-and-fast line. Every case is a problem of its own; these are the very cases where we must carefully individualize and guard ourselves against hindering future research by laying down any hard-and-fast rules. A question which no investigator of sexual problems has thus far satisfactorily answered, now suggests itself: Why is it that homosexuality and particularly male homosexuality has become the object of such terrific social abhorrence? Why is our penal code so backward in that respect? We can understand the reasons for that only in the light of the historic aspect of the problem. It is a striking fact that although female homosexuality always appears along with the male, it is not nearly so abhorred but is rather tolerated under the cover of silence. Austria is the only European country in which sexual intimacy between women is a penal offence. Probably the difference in this attitude bears some relation to the problem of reproduction, since man, as the fertilizing agent, plays a more active rôle than the woman.[47] The seed, that most precious possession with which a man may fructify several women, must not be squandered.