For instance, in the medieval Christian West, the Roman Catholic Church and powerful families fought bitterly over church efforts to end polygyny (a system which allows men to have multiple wives) and to advocate for the principle of consent and free will in marriage. In much of the world, however, polygyny remained the norm, and still does today. Even western Christian society has generally accommodated the idea of polygamy through serial monogamy, allowing divorce, or functional divorce through annulment. The Christian church may have promoted the ideals of procreation, affection and emotional sustenance through marriage, but among the elite, these values took a back seat to property, alliances and politics. Among the common folk, economic survival undergirded marital choice.