What we call "perverse" in the life of the adult, differs from the normal in the following respects: first, in disregard for the dividing line of species (the gulf between man and animal); second, being insensible to the conventional feeling of disgust; third, the incest-limitation (being prohibited from seeking sexual satisfaction with near blood-relations); fourth, homosexuality, and fifth, transferring the role of the genitals to other organs and other parts of the body. None of these limitations exist in the beginning, but are gradually built up in the course of development and education.
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