Endogamy

Endogamy is the cultural practice of only marrying within a specific social group, religious denomination, caste, or ethnic group, rejecting any from outside of the group or belief structure as unsuitable for marriage or other close personal relationships. Its opposite, exogamy, describes the social norm of marriage outside of the group.

upright=1.3|right|thumb|One legal definition of degrees of consanguinity. The number next to each box in the table indicates the degree of relationship relative to the given person.

right|thumb|Scene from the award-winning 2020 documentary Sologamy Sologamy or autogamy is marriage by a person to themself. Critics argue that the practice is not legally binding, unlike traditional marriage, whilst supporters of the practice argue that it affirms one's value and leads to a happier life.

marriage between relatives

marriage between individuals who are, in some culturally important way, similar to each other

marriage between an uncle and a niece or between an aunt and a nephew

South Korean law nullified in 2005