One Is Not Born a Woman: Simone de Beauvoir's "The Second Sex"

Simone de Beauvoir’s The Second Sex is one of the most important books of the twentieth century, a vast, learned, and revolutionary study of what it has meant, throughout history, to be a woman. Beauvoir brings the full apparatus of philosophy, biology, history, literature, and psychology to bear on a single question: why have women been treated, across cultures and centuries, as the second sex, the lesser, the other, defined always in relation to man? Her analysis is rigorous, unflinching, and at times overwhelming, and it laid much of the intellectual foundation for modern feminism. Reading it, I understood that its central insight reaches far beyond the question of gender alone.

Here is what The Second Sex taught me about woman as “the Other,” about the famous claim that one is not born but becomes a woman, and about the link between freedom and equality.

Key takeaways

• Woman has been defined as “the Other,” measured always against man as the norm.
• “One is not born, but rather becomes, a woman”: gender is largely socially constructed.
• History, myth, and custom have shaped and constrained women’s lives.
• Genuine liberation means women being free to define and create themselves.
• The analysis of “othering” illuminates many forms of oppression.

Woman as the Other

Beauvoir’s foundational concept is that of “the Other.” In culture after culture, she shows, man has been treated as the default, the universal human being, the standard against which everything is measured, while woman has been defined as the deviation, the second sex, understood only in relation to man rather than in her own right. He is the Subject, the Absolute; she is the Other. This relegation to otherness, Beauvoir argues, has shaped the entire condition of women, denying them the status of full, free subjects and casting them perpetually as object, as supporting character in someone else’s story. The concept is powerful precisely because it is general. The dynamic of defining one group as the norm and another as the deviant “Other” runs through racism, colonialism, and many forms of oppression. Beauvoir gave us a key that unlocks more than one door.

Becoming a woman

The single most famous sentence in the book is this: one is not born, but rather becomes, a woman. With it, Beauvoir draws a revolutionary distinction between biological sex and the social role of “woman.” Being female is a biological fact; but “femininity,” the whole set of behaviours, expectations, limitations, and identities a society assigns to women, is not natural or inevitable. It is constructed, taught, imposed, from childhood onward, by family, culture, education, and myth. Girls are made into “women” in the social sense by a thousand pressures and lessons, not born into a fixed feminine essence. This insight, that gender is largely a social construction rather than a biological destiny, transformed how we think about identity, and it follows directly from Beauvoir’s existentialist conviction that we are not born with a fixed essence but make ourselves, or are made, through our situation.

Freedom and equality

Beneath the historical and cultural analysis runs Beauvoir’s existentialist ethics, the same one she developed in The Ethics of Ambiguity. Human beings, she holds, are fundamentally free, called to transcend their circumstances and create themselves through their projects and choices. The tragedy of women’s situation is that they have been denied this freedom, confined to “immanence,” to a static, dependent existence, rather than the active “transcendence” of genuine self-creation. Real liberation, then, is not merely legal equality, important as that is, but the freedom for women to define themselves, to choose their own lives and projects, to be full subjects rather than the Other. This roots feminism in something universal: the claim that every human being deserves the freedom to create their own existence, and that to deny this to half of humanity is a profound injustice.

What I’m taking with me

The Second Sex is a monumental work, and Beauvoir deserves recognition as one of the major philosophers of her century. What I am taking from it is her penetrating concept of “the Other,” which illuminates not only the oppression of women but the structure of othering wherever it occurs; her transformative insight that gender is largely made rather than born, that we become what our societies shape us to be; and her grounding of equality in freedom, the conviction that every person deserves to be a full subject, free to create their own life. Beauvoir taught me to question what I have taken as “natural,” and to see the freedom that oppression denies.

Frequently asked questions

What is The Second Sex about?

It is Simone de Beauvoir’s landmark study of women’s oppression across history, arguing that women have been defined as “the Other” and that womanhood, as a social role, is constructed rather than biologically fixed.

What does “one is not born, but rather becomes, a woman” mean?

That biological sex is distinct from the social role of “woman.” Femininity is shaped by culture, upbringing, and expectation rather than being a natural, inborn essence.

What does Beauvoir mean by woman as “the Other”?

That man has been treated as the universal human norm while woman is defined only in relation to him, as the lesser, deviant “Other,” denied the status of a full, free subject.

References & further reading

1. Beauvoir, Simone de. The Second Sex. (1949; translated by H. M. Parshley, Knopf, 1953.)
2. Bair, Deirdre. Simone de Beauvoir: A Biography. Summit Books, 1990.
3. Okely, Judith. Simone de Beauvoir: A Re-reading. Virago, 1986.