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Why were clans with shared totems often exogamous?

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totem fish mask — Totemism Totem fish mask from the Orokolo Bay area of New Guinea. Painted bark cloth over rattan frame with fringe of dried grass. Height 1.63 m.

Clans with shared totems were often exogamous because they were defined by kinship rather than just shared religious or symbolic identification. In these societies, members of a clan considered themselves to be related, regardless of whether a definitive genetic connection could be traced.12

Because clans functioned as groups of kin, marrying a member of one's own clan was typically considered a form of incest. Consequently, exogamy—the custom of marrying outside one's own group—served as a vital social rule to maintain the structure of these communities. By requiring individuals to marry outside their own clan, these societies established reciprocal obligations between different groups, often viewing specific clans as ideal, complementary marriage partners.12

In this context, clan membership was a stable, lifelong social identity that structured community life, ensured the care of vulnerable members, and prevented the social and moral complications associated with marrying within one's own kin group.2