Exogamy

In The Second Sex, exogamy is more than a restriction against marrying within one’s own group: it is a system for creating relations between groups by making women available for exchange. Simone de Beauvoir uses this account to show how kinship rules can assign women an outsider’s status, not because of an inherent difference, but because of their position in a social structure.

Definition and Social Function

Exogamy directs marriage beyond the clan. Drawing on Claude Lévi-Strauss’s account of kinship, the book argues that the incest prohibition is not necessarily the original cause of exogamy. Rather, the ban can express a positive social purpose: a clan forms relations with another clan by giving or exchanging women, instead of closing in on itself. The social benefit lies in establishing reciprocal connections between groups.

This arrangement turns women into instruments of communication between clans. A woman of the same clan is treated as belonging to the group and therefore as someone who must become “other” through her position in an exchange. Otherness, in this account, is structural rather than innate: it is produced by a woman’s place in a relationship between groups.

Marriage, Otherness, and Male Transcendence

The book also interprets exogamy through men’s asserted desire to move beyond the world associated with maternal descent. A man is bound through his mother to his clan, ancestors, and material subsistence; marriage, by contrast, offers a way to enter adult standing and claim a place in the wider world. By joining himself to someone represented as foreign to him and his clan, he appears to break from the inheritance of his origins and affirm a future beyond them.

The account links this impulse to the broader contrast between immanence and transcendence. Women are associated with the continuity of life and the clan, while men claim the activities said to open society outward. Exogamy thus becomes part of a system in which male movement and social expansion are valued, while women’s position is defined through the connections they enable. The book presents this as an interpretation of the social meaning attributed to marriage, not as a natural consequence of women’s characteristics.

Exchange and the Making of Kinship

In the kinship analysis discussed in the book, the relevant distinction is not an intrinsic difference between women of one clan and another. A woman is treated as exchangeable because a social structure assigns her a position that marks her as belonging elsewhere. The exchange can be returned in kind, creating an ongoing relationship between groups. Exogamy therefore does not merely separate relatives; it organizes relationships beyond the group by making marriage a form of social connection.

This reading clarifies the connection between exogamy and otherness: the woman must be socially positioned as different from the group that gives her, even though the difference is not an innate trait. Her role as the means of exchange helps unite groups, while her own position remains defined by the structure that uses her to establish that bond.

Historical and Critical Significance

The discussion places exogamy within a larger account of women’s subordination. Beauvoir argues that women have been subordinated across recorded history, but cautions that what appears natural or immutable is not thereby beyond change. Kinship customs help make women’s otherness seem like a given, even when that status arises from social relations and inherited arrangements.

The book’s analysis also makes clear that exogamy alone does not explain women’s social condition. It is one practice within wider systems of descent, marriage, property, and power. Its significance lies in showing how a rule that creates ties between groups can simultaneously define women through their use in those ties, making social difference appear inherent when it is produced by structure.