What is the term for the prohibition of sexual relationships between certain relatives?

The term that refers to the prohibition of sexual relationships between certain relatives is the incest taboo. This concept is a foundational element in many cultures and societies, rooted in the belief that such relationships can lead to negative social, psychological, and biological consequences. The incest taboo helps to establish family boundaries and social structures, ensuring that individuals within a family unit engage in appropriate social behaviors and maintain distinct familial roles. By prohibiting sexual relationships among relatives, societies aim to prevent inbreeding and the resultant genetic issues, while also promoting social cohesion and the establishment of alliances through external marriage.

The other terms can clarify the broader context of familial and social relationships. Endogamy refers to the practice of marrying within a specific social, cultural, or religious group, which is different from the restrictions implied by the incest taboo. Exogamy, conversely, is the practice of seeking a spouse outside one's own group, which contrasts with both endogamy and the incest taboo. Gender norms pertain to the societal expectations around behavior based on one's gender, which, while related to family dynamics, do not specifically address the prohibition of sexual relationships between relatives.