Incest

Incest is sexual activity between people whose close family relationship makes it socially prohibited or legally restricted. Definitions vary across cultures and legal systems, especially for relationships by marriage or adoption.

Kinship: The system of social relationships connecting people through descent, marriage, adoption, or other ties. Incest rules depend on which family relationships a society recognizes.
Child sexual abuse: Sexual abuse involving a child, including conduct imposed by an adult or another person with power. Incest describes a family relationship; child sexual abuse describes exploitation or abuse involving a child.
Incest taboo: A social prohibition on sexual relations or marriage between people defined as close relatives. The taboo is the broader cultural rule; incest names the prohibited relations it regulates.
Incest laws: Statutes that prohibit or regulate sexual relations or marriage between specified relatives. Legal rules define prohibited relationships and penalties differently across jurisdictions.
Consanguinity: Biological relatedness between people who share an ancestor. Many legal definitions distinguish blood relationships from relationships created by marriage or adoption.
Exogamy: The social rule or practice of marrying outside a specified group. Exogamy is a marriage rule that can prohibit unions without defining them as incest.
Westermarck effect: A proposed tendency for people raised closely together in early childhood to develop sexual disinterest in one another. It offers an evolutionary explanation for some incest avoidance, independent of explicit rules.
Trauma: Psychological or physical harm that can follow overwhelming or threatening experiences. Coercive or abusive incest can cause lasting trauma, though outcomes vary.
Marriage: A socially and legally recognized union that establishes relationships and rights between spouses and families. Marriage can create prohibited relationships between relatives by affinity, not descent.
Endogamy: The social rule or practice of marrying within a specified group. Endogamy permits within-group marriage, while incest rules may prohibit particular close kin unions.

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Sexual exploitationCompared with: Incest can involve exploitation, but kinship alone does not define the broader concept.