血缘婚，亦称“血缘家庭”，原始社会中同一原始群体内同辈男女间的集团婚。血缘婚限于在同行辈（如兄弟姐妹）间互为夫妻，排除不同行辈（如父与女、母与子、祖父与孙女、祖母与孙子）间的性关系，是人类第一个婚姻形态（制度），血缘婚形成的群落是血缘家族，在血缘家族阶段，还没有产生氏族，是原始群向氏族公社过渡时期的婚姻家庭形态之一。
兄妹婚型洪水神话历来被视为是人类早期存在过血缘婚阶段的重要论据。
The brother-sister-get-married pattern flood mythology has always been taking as the evidence of consanguineous marriage, which is a misinterpretation.
中国古代婚姻制度曾经历了原始群婚、血缘群婚、亚血缘群婚、对偶婚等形态。
Chinese ancient marriage institutions once went through the patterns of original group marriage, consanguineous group marriage, sub-consanguineous group marriage and duality marriage etc.
“姑舅表婚制”是人类自血缘家庭建立以来，一直普遍存在的一种特殊的婚姻形式。
The marriage System of Cousinship "is a special marriage form, which has universally existed since human beings instituted consanguineous family."
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