All cultures have a form of rule that forbids sexual relations with close relatives,ostensibly to

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Quizplus · Accepted Answer

The main purpose of the rule is to prevent incest, which is considered taboo in most cultures. While there may be some genetic benefits to avoiding relationships with close relatives, the cultural and social taboo against incest is typically the primary reason behind this rule. Property redistribution and prevention of birth defects may also be secondary benefits, but they are not the primary reason for the rule.

All Cultures Have a Form of Rule That Forbids Sexual