I do not consider that we can decide the precise degree in which masturbation may fairly be called normal so long as we take masturbation by itself. We are thus, in conclusion, brought back to the point which I sought to emphasize at the outset: masturbation belongs to a group of auto-erotic phenomena. From one point of view it may be said that all auto-erotic phenomena are unnatural, since the natural aim of the sexual impulse is sexual conjunction, and all exercise of that impulse outside such conjunction is away from the end of Nature. But we do not live in a state of Nature which answers to such demands; all our life is "unnatural." And as soon as we begin to restrain the free play of sexual impulse toward sexual ends, at once auto-erotic phenomena inevitably spring up on every side. There is no end to them; it is impossible to say what finest elements in art, in morals, in civilization generally, may not really be rooted in an auto-erotic impulse. "Without a certain overheating of the sexual system," said Nietzsche, "we could not have a Raphael." Auto-erotic phenomena are inevitable. It is our wisest course to recognize this inevitableness of sexual and transmuted sexual manifestations under the perpetual restraints of civilized life, and, while avoiding any attitude of excessive indulgence or indifference,[[352]] to avoid also any attitude of excessive horror, for our horror not only leads to the facts being effectually veiled from our sight, but itself serves to manufacture artificially a greater evil than that which we seek to combat.
The sexual impulse is not, as some have imagined, the sole root of the most massive human emotions, the most brilliant human aptitudes,—of sympathy, of art, of religion. In the complex human organism, where all the parts are so many-fibred and so closely interwoven, no great manifestation can be reduced to one single source. But it largely enters into and molds all of these emotions and aptitudes, and that by virtue of its two most peculiar characteristics: it is, in the first place, the deepest and most volcanic of human impulses, and, in the second place,—unlike the only other human impulse with which it can be compared, the nutritive impulse,—it can, to a large extent, be transmuted into a new force capable of the strangest and most various uses. So that in the presence of all these manifestations we may assert that in a real sense, though subtly mingled with very diverse elements, auto-erotism everywhere plays its part. In the phenomena of auto-erotism, when we take a broad view of those phenomena, we are concerned, not with a form of insanity, not necessarily with a form of depravity, but with the inevitable by-products of that mighty process on which the animal creation rests.
For a bibliography of masturbation, see Rohleder, Die Masturbation, pp. 11-18; also, Arthur MacDonald, Le Criminel Type, pp. 227 et seq.; cf. G. Stanley Hall, Adolescence, vol. i, pp. 432 et seq.