Male Attractiveness Strategy

The he-man strategy is a model of female mate choice in which a female, expecting little or no parental help from the father, seeks to secure good genes for her offspring by carefully choosing among males. It links unequal reproductive investment to selective mating, the concentration of reproduction among a small number of males, and the possibility that attractiveness can become an advantage in its own right. In the book’s account, it is one of two broad strategies available to females, contrasted with domestic bliss, and its expression depends on the conditions in which a species lives.

Definition and Evolutionary Context

The strategy begins with a conflict of interest between mates. Each parent shares half of its genes with a child, but an individual that can reduce its investment in one offspring may have more resources available for other offspring with different partners. The two partners therefore have a potential incentive to shift the costs of parental care onto one another. The book frames mating not only as cooperation in producing and raising young, but also as a relationship in which each sex may seek to benefit its own reproductive output at the other’s expense.

In that framework, the he-man strategy describes the female response when she effectively gives up expecting help from the father. She withholds copulation from unsuitable males and discriminates among potential partners, attempting to ally her genes with a male whose own genes may improve the survival prospects of their sons and daughters. The expression “good genes” refers to inherited qualities that may benefit offspring; it is not a claim that any single visible feature guarantees an individual’s genetic value.

The strategy is presented alongside domestic bliss as one of two broad female counter-ploys to male tendencies toward promiscuity and limited paternal care. These are analytical categories, not an assertion that every species follows one fixed pattern. The account allows intermediates between them and notes that, in some species, fathers provide more childcare than mothers. The reproductive arrangements found in a species therefore depend on ecological circumstances and on how male and female strategies respond to one another.

Choosing Males and Concentrating Mating

A female following the he-man strategy is described as choosing carefully rather than mating indiscriminately. If potential partners differ in heritable qualities, a female that can identify useful differences may increase the prospects of her own offspring by choosing a male with advantageous traits. In the book’s rowing-crew analogy, the female seeks good crew-mates for her genes, avoiding a mate whose inherited qualities could disadvantage them.

If females share similar information about which males appear most desirable, their preferences can converge. A small number of favored males may then obtain most of the matings. Since the males’ contribution to each mating is comparatively inexpensive, those successful individuals may reproduce with many females. The resulting arrangement gives a few males a disproportionate share of reproduction, while females’ selectivity determines which males gain that opportunity. The book identifies elephant seals and birds of paradise as cases in which it supposes this pattern may occur, though the routes to male success need not be the same.

The qualities females might use as evidence are not limited to sexual display. Strength may suggest the ability to obtain food, while long legs may suggest the ability to escape predators. Such features could benefit offspring of either sex, making them plausible indicators of underlying qualities. A male’s having survived to adulthood is also evidence of survival, but longevity alone does not establish that he will sire many descendants: a long-lived male might have survived precisely because he took fewer reproductive risks. Female choice, in this account, is therefore not reducible to choosing the oldest male or the most conspicuous one.

From Useful Indicators to Runaway Attractiveness

The account distinguishes traits that initially provide evidence of useful inherited qualities from traits that become desirable because females already favor them. A slightly longer tail in an ancestral bird of paradise might at first have signaled good condition—for example, an ability to obtain food or avoid predators. The tail need not itself have been inherited as a beneficial quality for its appearance to work as an indicator; what matters in the proposed explanation is that variation in tail length is partly heritable and that females initially prefer longer-tailed males.

Once that preference becomes established, attractiveness can reinforce itself. A female mating with a highly attractive male may have sons who are, in turn, attractive to females. If those sons obtain many matings, their mother may have many grandchildren. Sexual attractiveness can consequently become desirable not only because a feature signals practical advantages, but because it helps male descendants win mates. The book presents this feedback as a possible unstable, runaway process, through which an extravagant feature such as the tail of a male bird of paradise can be favored even after its value as a straightforward indicator has become less important.

This argument makes the he-man strategy a link between female preference and the evolution of male display. The female is not simply selecting a useful trait for its immediate contribution to survival: her choice can also favor sons who will be chosen by females in the next generation. The resulting reproductive advantage can amplify preference and display together, turning attractiveness into a consequential inherited advantage.

Other Routes to Male Success and the Limits of the Model

Sexual attractiveness is not the only route the book associates with the he-man strategy. Elephant seal males may secure and retain harems by defeating rivals rather than by being aesthetically preferred. A female that mates with a harem-holder may thereby mate with an individual able to withstand repeated challenges; his sons may inherit an ability to hold a harem. The book also refers to female preferences for males that hold territories or occupy high status in a dominance hierarchy. These examples extend the general idea of choice for potentially advantageous qualities, while showing that the relevant evidence may concern competitive success rather than ornament.

The chapter’s broader account holds that breeding systems—including monogamy, promiscuity, and harems—reflect conflicts of interest between the sexes as well as differences in parental investment. Because males produce many small sperm and females produce a limited number of larger eggs, the book proposes that males will generally be more inclined toward promiscuity and less parental care. Female responses, including the he-man and domestic-bliss strategies, vary with ecological circumstances, as do male responses. The model therefore allows paternal care and mating arrangements to differ across species rather than treating the he-man strategy as a universal rule.

Human societies further qualify any simple biological prediction. The book describes a wide range of human arrangements, including monogamous, promiscuous, and harem-based societies, and argues that this variety suggests that human ways of life are largely shaped by culture. It nevertheless allows for possible average tendencies toward greater male promiscuity and greater female monogamy, while stressing that which tendency prevails in a particular society depends on cultural circumstances. The he-man strategy thus functions as an evolutionary model for interpreting one possible response to unequal investment, not as a prescription for human conduct or a complete account of human relationships.