One cultural universal is the incest taboo, which is a norm forbidding

Which is a norm forbidding " sexual relations or marriage between some relatives".

A cultural universal, likewise called an anthropological universal, is a component, example, attribute, or organization that is regular to every human culture around the world.

The incest is and has been a standout among the most across the board of every social taboo, both in present and in numerous past societies. Most current social orders have laws with respect to incest or social limitations on nearly consanguineous relational unions.