One norm found everywhere is the incest taboo,which refers to norms forbidding

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The incest taboo is a norm forbidding sexual relations or marriage between certain relatives, usually considered too closely related to marry or have sexual relations with. This norm is found in almost every society, although the precise definition of who is considered a close relative may vary. Option A and C are incorrect as they don't relate to the incest taboo. Option D is also incorrect as there is no norm that forbids sex except for the purpose of having children.

One Norm Found Everywhere Is the Incest Taboo,which Refers to Norms