John and Robert have been involved in a same-sex relationship for two years. They can't marry because our society has a(n):

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The exogamy rule refers to the cultural rule that requires individuals to choose a marriage partner outside of their own social group, and same-sex marriage is not recognized as a legal option under this rule. The miscegenation rule refers to laws that prohibit interracial marriage, the endogamy rule refers to cultural norms that promote marrying within one's own social group, and the propinquity rule refers to the tendency for individuals to form relationships with people who are physically close to them.

John and Robert Have Been Involved in a Same-Sex Relationship