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Tldr; complete sexual freedom leads to a collapse of culture. Some moral laws will seem to limit human pleasure in the short term, but will prevent great suffering or maximize happiness and fulfillment in the long term.
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Why Sexual Morality May be Far More Important than You Ever Thought — Quest
Oxford social anthropologist J.D. Unwin discovered that when a highly developed culture undergoes an increase in sexual freedom, a collapse of that culture follows within three generations. The historical data reveals this pattern with “monotonous” regularity.