This preference for exogamy, Gutman suggests, may have derived fromWest African rules governing marriage, which, though they differed from one tribalsgroupsto another, all involved some kind of prohibition against unions with close kin.

• 古特曼表示,这种对于外部通婚的偏爱很有可能缘起于西部非洲制约着婚姻的规定,尽管这些规定在一个和另一个部落群体之间不尽相同,但都涉及到某种对近亲联姻。