Exodus 20
You Shall Not Commit Adultery

This is one of those commandments that seems straight-forward but the context in the Ancient Near East makes it sound strange. Sex, marriage and baby-making has changed radically since the days of Genghis Khan. High status men still bed many women but they don't produce young. Christianity changed the assumptions about gender equality in marriage but since the 1960s the sexual revolution and the pill have reshaped the map. Why will Christianity's demanding sexual standard not go away? Sex is sort of a portal, sort of a sacrament to link us to another world.

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