外婚制是早期部落時代的一種婚姻規定,某人只被允許在自身氏族、文化或者社會團體之外選擇配偶。部落內部不同氏族可以結婚,而同一氏族男女不為配偶。中國在西周時期稱之為同姓不婚。這種制度的出現,從優生學的角度來講可以避免近親繁殖從而降低遺傳病的發病率[1]

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