Simone de Beauvoir opens The Second Sex with a question that sounds simple: what is a woman? Her answer takes over a thousand pages and lands on a claim that changed the world: 'One is not born, but rather becomes, a woman.' Not just women — anyone. We are not given our nature at birth. We become what we are through the situations we find ourselves in, the possibilities open to us, and the choices we make within those constraints.
Too little constraint: the agents scatter, their paths go nowhere. Too much: they converge on the prescribed trajectory and lose individual shape. de Beauvoir's situated freedom lives in the middle — where constraint is real enough to push against and open enough to allow genuine choice. Authentic existence is not freedom from situation. It is freedom within it.
Simone de Beauvoir's central claim in The Second Sex is easy to state and difficult to absorb: there is no essential 'woman,' no female nature prior to experience. What we call femininity is constructed through a situation — through the specific conditions of a woman's life in a particular historical and social context. The situation is not chosen. But the response to the situation, within it, is the locus of freedom and therefore of responsibility.
Situation and freedom
de Beauvoir is a Sartrean existentialist, but she modifies Sartre in a crucial way. Sartre's freedom is absolute and unconditional — you are always free, regardless of your situation. de Beauvoir says: no. Freedom is always situated. A woman in 1949 France had genuine freedom, but not the same freedom as a man of the same class. The situation constrains. But it does not determine. Within the constraint, there is genuine choice. The failure is to deny either the constraint or the choice.
One is not born, but rather becomes, a woman. No biological, psychological, or economic fate determines the figure that the human female presents in society; it is civilisation as a whole that produces this creature. — Simone de Beauvoir, The Second Sex
Bad faith and complicity
de Beauvoir extends Sartre's concept of bad faith to the specific condition of women who accept their situation as natural and inevitable — who consent to being the 'Other' rather than demanding to be a subject. This is not straightforward self-deception. It is often a rational response to constraints that make resistance costly. But de Beauvoir insists on calling it what it is: a choice made in a situation, not a fate suffered. The recognition of it as a choice is the first condition of changing it.
The argument of The Second Sex is often summarised as 'gender is a social construction.' This is not quite right. de Beauvoir's claim is more specific: the meaning of the biological female body is constructed through a situation, and that construction is political. The body is not irrelevant. But its relevance is not fixed. What it means to have a female body in Chile in 1949 is different from what it means in the same body in 2025. The body is constant; the situation changes; the self becomes.
What becomes
The most interesting implication of de Beauvoir's claim is that becoming is never finished. You are not born as anything; you are always becoming something. This is true of women, in her specific argument. It is also true more generally. The self that is 'becoming' rather than 'being' is always open to revision — not infinitely, not without cost, but genuinely. The constraint is real. The openness within the constraint is also real. To deny either is to misunderstand what it is to be human.