Those who condemn the other [sexual] practices (which have no doubt been common among mankind from primeval times) as being perversions, are giving way to an unmistakable feeling of disgust, which protects them from accepting sexual aims of the kind. The limits of such disgust are, however, often purely conventional: a man who will kiss a pretty girl’s lips passionately, may perhaps be disgusted at the idea of using her tooth-brush, though there are no grounds for supposing that his own oral cavity, for which he feels no disgust, is any cleaner than the girl’s. Here, then, our attention is
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