Puberty

Puberty is presented in The Second Sex as more than a stage of bodily development: it is a point at which reproductive biology becomes a lived and socially interpreted condition. The onset of menstruation brings the species’ reproductive cycle into a girl’s body, but its meaning is not predetermined by physiology. Under a social order that associates femininity with inferiority, puberty can make the girl experience her body as alien and her future as already constrained. The book’s argument holds these pressures together while refusing to treat them as destiny: biological facts shape women’s situation, but do not by themselves explain or justify their subordination.

Biological Transition and Bodily Strain

The account distinguishes girls’ puberty from boys’ in both timing and bodily course. Girls generally change into women at thirteen or fourteen, while boys reach adolescence around fifteen or sixteen. At puberty, ovarian activity intensifies, a mature ovum appears, the menstrual cycle begins, the genital system reaches its definitive form, and the body’s endocrine balance is established. These changes are described not as a smooth, purely individual development but as the species’ reproductive function asserting itself in the growing person.

The transition is characterized as a crisis partly because it can place a significant burden on the developing body. The book gives mortality comparisons for the period: before puberty, approximately the same number of girls die as boys for every hundred; from fourteen to eighteen, the figure rises to 128 girls for every 100 boys, and from eighteen to twenty-two it is 105. It also names chlorosis, tuberculosis, scoliosis, and osteomyelitis among conditions that may occur during this period. Puberty can begin unusually early, at four or five, or fail to begin; the account also mentions amenorrhea, dysmenorrhea, and masculine characteristics associated with excessive adrenal secretions. These variations are treated as bodily conditions, not as proof that an individual has escaped the pressures of reproduction.

The reproductive cycle extends beyond the first onset of menstruation. From puberty to menopause, the woman’s body becomes the site of recurring processes whose ends are linked to the egg and the preparation of the uterus. The book describes the monthly cycle as involving the wider body, not merely the reproductive organs, and treats its effects as one source of alienation: bodily activity is experienced as something that happens within the subject but does not necessarily serve her individual purposes. This biological account supplies part of the context for puberty without making it a complete explanation of the girl’s condition.

Menstruation and Its Social Meaning

Menstruation is the moment when the reproductive significance of puberty becomes difficult to ignore. The account contrasts the girl who has not yet understood the changes in her body with the girl for whom the first period makes their meaning unmistakable. Some girls may initially take pride in becoming women, anticipating the development of their breasts or padding their blouses; the arrival of menstruation can transform that anticipation into shame or fear. Others have already felt discomfort, which the first period confirms. The event is therefore not assigned one uniform emotional response: its effect depends partly on what the girl has been taught to expect and how she understands the condition being imposed on her.

A lack of preparation can intensify the crisis. The book reports that mothers often explained pregnancy, childbirth, and sexual relations more readily than menstruation, leaving daughters without clear knowledge of what was happening. It cites Havelock Ellis’s 1896 survey of 125 American high-school students: 36 had known nothing about menstruation before their first period, while 39 had only vague ideas. The account further notes that Helene Deutsch found little change by 1946. In this setting, an unfamiliar bodily event could be interpreted as illness, injury, or punishment; one case cited by Ellis concerns a girl who jumped into the Seine at Saint-Ouen because she believed she had an unknown disease. The book uses such reports to show the consequences of silence and stigma, not to suggest that every girl responds in the same way.

The decisive claim is that menstrual shame is socially intensified. The same physical process could be approached differently in a sexually egalitarian society, where it would mark one route into adult life rather than a sign of inferiority. In the existing order described by the book, however, menstruation is made to confirm the girl’s supposedly lesser status. The stain becomes a verdict about what being a woman means, and a fate that had seemed to belong to the future is felt as lodged in the body. Puberty thus exposes the difference between a bodily change and the meanings a culture imposes on it.

Divergent Futures for Girls and Boys

The argument turns on the unequal futures puberty announces. Boys may also feel awkward about bodily change, but their developing virility is presented as a source of pride and as a passage toward the recognized status of men. Girls, by contrast, encounter femininity as a set of limits they are expected to inhabit. Puberty does not simply bring both sexes toward adulthood in parallel: it directs boys toward a socially affirmed identity, while girls confront a future that the surrounding culture has already described as constrained.

The contrast is not explained by physiology alone. The book argues that the penis acquires its privileged social value within a social context, just as menstruation is made into a curse by that context. If the body were interpreted without a hierarchy that degrades femininity, the same event would not necessarily undermine the girl’s self-respect. A girl who can pursue projects in sport, social life, intellectual work, or religious activity may experience her bodily specificity less as mutilation and more as one part of a life she actively makes. The possibility does not remove bodily difficulty; it shows that its significance is not fixed in advance.

This contrast also clarifies why puberty can affect a girl’s sense of time. Childhood had allowed her to experience herself in the present as an individual engaged in studies, games, and family or friendship. With puberty, the future seems to draw nearer and take bodily form, while the present risks becoming merely transitional. The account describes the girl’s youth as consumed by waiting: her own purposes may seem provisional beside the predetermined role she is taught to expect. Puberty therefore alters not only bodily experience but also the girl’s relation to the present and the future.

The Body, Social Situation, and Freedom

Puberty is one part of a larger argument against treating biological difference as destiny. The book acknowledges that the body is an essential element of the situation women occupy and that reproductive processes can constrain individual life. Yet it insists that a body has lived reality through consciousness, actions, and society. Biology cannot answer by itself why woman is made the Other; the question is how human societies have taken up nature in history and what they have made of the human female.

This distinction follows the book’s wider existentialist account of freedom. A subject realizes freedom through projects and movement toward an open future; when transcendence is forced into immanence, the result is frustration and oppression. The girl’s puberty matters in this framework because bodily development occurs within social expectations that may attempt to fix her as an object and narrow her possible future. The crisis is not simply that her body changes, but that the culture around her treats those changes as grounds for assigning her an inessential place.

The account also connects reproductive limitation to domestic repetition. It argues that giving birth and breastfeeding, as natural functions, do not by themselves provide a project through which a woman can claim a higher meaning for her existence. When motherhood is joined to housework as her assigned sphere, daily labor can confine her to repetition rather than open a future. Later descriptions of rural women make that structure concrete: a peasant woman may rise at dawn to feed animals, prepare meals, care for children, and work in the fields, with pregnancy and childcare adding to her responsibilities. Puberty is not the sole cause of such a life, but it is part of the bodily history that society interprets and places within it.

Consequences and Significance

The book’s account of puberty culminates in the adolescent girl’s divided position: she cannot enter adulthood without confronting femininity, yet femininity has been presented to her as a damaged and restricted condition. Inferiority, initially understood as a deprivation, can become a felt stain and fault. The girl approaches the future wounded by shame, anxiety, and guilt—not because biology necessarily assigns those meanings, but because bodily experience has been interpreted through a hierarchy that marks the feminine as inferior.

This framing also connects puberty to the book’s discussion of sexual initiation. The young woman’s erotic experiences are described as potentially abrupt, disruptive, and formative, with consequences that may continue through the rest of her life. Puberty does not mechanically determine those outcomes; rather, it is a formative point at which bodily change, social instruction, secrecy, and expectation meet. The book’s emphasis is on the seriousness of that encounter and on the different conditions under which girls and boys are directed toward adulthood.

Ultimately, puberty serves as a case through which The Second Sex separates biological facts from social fate. Its physiological changes are consequential, and the reproductive cycle can impose real strain, but neither those changes nor their variations establish a natural hierarchy between the sexes. The girl’s experience becomes oppressive when society turns bodily difference into shame, passivity, and a prewritten future. By distinguishing the body’s material situation from the meanings attached to it, the account leaves room for freedom: bodily specificity remains real, while the life built around it need not be fixed by biology alone.