Final answer:
The incest taboo is a cultural norm that prohibits sexual relations between parents and their offspring and sometimes extends to other close relations. Exogamy refers to a union of spouses from different social categories, while endogamy involves choosing partners within one's own social class or background.
Step-by-step explanation:
The incest taboo is a cultural norm that prohibits sexual relations between parents and their offspring and sometimes extends to other close relations. In some societies, this taboo may even include first cousins. The exogamous marriage refers to a union of spouses from different social categories, while an endogamous marriage involves choosing partners within one's own social class or background.