Charles:
Yes, Levi-Strauss points to incest taboo as universal. I'm not sure if I understand your placement of the explanation as "biological" or "cultural", but isn't Levi-Strauss' explanation cultural in _The Elementary Structures of Kinship_ ? He says the incest taboo develops because marrying "out" of the group is the basis for forming alliances with other groups. If a group marries inward, it will shrivel _socially_. Exogamy is socially, not biologically, caused.
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I thought he viewed ir problematically? You're the anthro guy -- I defer to you.
(Don't mammals generally avoid intercourse with littermates?)
Nu, zayats, pogodi!
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