The incest taboo-rules that forbid sexual relations with close relatives such as siblings and parents-is:

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The incest taboo is a universal cultural norm in all societies around the world, though the specific rules and definitions of incest vary between cultures. This suggests that the taboo has deep roots in human evolutionary history and is likely linked to concerns about genetic abnormalities and the promotion of social cohesion.

The Incest Taboo-Rules That Forbid Sexual Relations with Close Relatives