With Christianity, the new motive of avoidance of sin enters in, and the moral standard becomes in theory the same for men as for women, though in practice the difficulty of enforcing it upon men has always led to a greater toleration of their fallings than of those of women. Early sexual morality had a plain biological purpose, namely to ensure that the young should have the protection of two parents during their early years and not only of one. This purpose was lost sight of in Christian theory, though not in Christian practice.
Source: Marriage and Morals, 1929, by Bertrand Russell
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