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Cousin marriage, or consanguinity , is allowed and often encouraged throughout the Middle East, and in other Muslim countries worldwide such as Pakistan. As of 2003, an average of 45% of married couples were related in the Arab world. While consanguinity is not unique to the Arab or Islamic world, Arab countries have had "some of the highest rates of consanguineous marriages in the world". The bint 'amm marriage, or marriage with one's father's brother's daughter is especially common, especially in tribal and traditional Muslim communities, where men and women seldom meet potential spouses outside the extended family. Anthropologists have debated the significance of the practice; some view it as the defining feature of the Middle Eastern kinship system while others note that overall rates of cousin marriage have varied sharply between different Middle Eastern communities. In pre-modern times rates of cousin marriage were seldom recorded. In recent times, geneticists have warned that the tradition of cousin marriage over centuries has led to recessive genetic disorders.