Auto-erotism may be said to include those transformations of repressed sexual activity

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Definition of Auto-erotism—Masturbation only Covers a Small Portion of the Auto-erotic Field—The Importance of this Study, especially To-day—Auto-erotic Phenomena in Animals—Among Savage and Barbaric Races—The Japanese rin-no-tama and other Special Instruments for Obtaining Auto-erotic Gratification—Abuse of the Ordinary Implements and Objects of Daily Life—The Frequency of Hair-pin in the Bladder—The Influence of Horse-exercise and Railway Traveling—The Sewing-machine and the Bicycle—Spontaneous Passive Sexual Excitement—Delectatio Morosa—Day-dreaming—Pollutio—Sexual Excitement During Sleep—Erotic Dreams—The Analogy of Nocturnal Enuresis—Differences in the Erotic Dreams of Men and Women—The Auto-erotic Phenomena of Sleep in the Hysterical—Their Frequently Painful Character. By "auto-erotism" I mean the phenomena of spontaneous sexual emotion generated in the absence of an external stimulus proceeding, directly or indirectly, from another person. In a wide sense, which cannot be wholly ignored here, auto-erotism may be said to include those transformations of repressed sexual activity which are a factor of some morbid conditions as well as of the normal manifestation of art and poetry, and, indeed, more or less color the whole of life.