Certainly, the human-animal distinction is still workable; after all, we rarely make errors in assigning entities to one category or the other. But after Darwin, the distinction suddenly seems arbitrary – as arbitrary as the equally workable distinction between, say, turtles and non-turtles.

Human beings are, by nature, the kind of animal that falls in love. The cross-cultural record also suggests that humans are also the kind of animal that commonly provides biparental care for its young. In 95% to 97% of mammalian species, only the females care for the young. We would no more expect males in these species to invest in their offspring than we would expect them to get pregnant or lactate. Humans are not like that.

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[Sociocultural] explanations are vulnerable to a number of criticisms. To begin with, it is unclear to what extent current social influences actually point in the direction these explanations presuppose. According to one study, by four years of age, girls tend to assume that boys are academically inferior, and by seven, boys assume the same thing. Similarly, teachers tend to view their female students as superior at maths and reading, even when aptitude tests indicate that the boys are doing better. Popular culture often mirrors these trends, with girls depicted as academically superior to boys (consider, for instance, Bart and Lisa from The Simpsons, and Ron and Hermione from the Harry Potter series.

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The reproductive benefits of polygyny were so great for genes located in male bodies that the male mind might still have evolved to take advantage of those opportunities, if and when they did arise. As a result, men may harbor strong polygamous desires — much stronger than women’s — even if these desires are frustrated for most men throughout most of their lives.

When it comes to the traits we consider most important in a long-term mate, human beings are largely monomorphic. This is one of the most significant findings of these studies; however, it is easily overlooked when the discussion becomes fixated on traits that people consider less important but where sex differences are found. By shining a spotlight on these traits, we may create an inaccurate picture of our species, even though the differences are real. Our picture of human nature may be built on a foundation of exceptions to the rule. The rule — the fact that males and females in our species are surprisingly similar in many ways — may be relegated to the background. By taking genuine differences and then exaggerating their importance, our picture of our evolved nature may become a caricature: It may contain a recognizable grain of truth but distort its object.

In the quest to promote women in STEM, academics and activists may sometimes inadvertently overstate the ubiquity of bias and discrimination against women in this sector. An unintended consequence may be to scare away some women who would otherwise be interested in a STEM career... If women are given the impression that the STEM workplace is a hotbed of sexism and an unwelcome place for women, many might quite understandably decide to look for other fields in which to make their mark.

Language, intelligence, and humor, along with art, generosity, and musical ability, are often described as human equivalents of the peacock’s tail. However, peacocks afford a poor analogy for the role of courtship displays in humans. Other animal models offer a better fit. In a number of nonhuman species — species as diverse as sea dragons and grebes — males and females engage in a mutual courtship “dance,” in which the two partners mirror one another’s movements. In Clark’s grebes and Western grebes, for instance, the pair bond ritual culminates in the famous courtship rush: The male and female swim side by side along the top of the water, with their wings back and their heads and necks in a stereotyped posture. If we want a nonhuman analogue for the role of creative intelligence or humor in human courtship, we should think not of ornamented peacocks displaying while drab females evaluate them. We should think instead of grebes engaged in their mating rush or sea dragons engaged in their synchronized mirror dance. Once we have one of these alternative images fixed in our minds, we can then add the proviso that there is a slight skew such that, in the early stages of courtship, men tend to display more vigorously and women tend to be choosier. However, this should be seen as a qualification to the primary message that intelligence, humor, and other forms of sexual display are part of the mutual courtship process in our species.

If men in our evolutionary past did not invest in offspring, they would not have evolved strict mate preferences and thus women would be as drab as peahens. The fact that women are not as drab as peahens suggests a long history of male mate choice, which in turn suggests a long history of pair bonding and high male parental investment.

Evolutionary theory answers one of the most profound and fundamental questions human beings have ever asked themselves, a question that has plagued reflective minds for as long as reflective minds have existed in the universe: why are we here?

The distinction between central and peripheral claims is applicable to many aspects of human sexuality. Consider, for instance, the emotion of jealousy. Evolutionary psychologists place a strong emphasis on sex differences in this domain. The standard claim is that men are more worried by a partner’s sexual infidelity than emotional infidelity, whereas women are more worried by a partner’s emotional infidelity... [However] the overwhelming trend is that most men and most women are extremely upset by both sexual and emotional infidelity. This suggests that the central EP claim regarding jealousy should be “Human beings evolved to experience jealousy in romantic relationships” rather than “Men and women evolved different patterns of jealousy.” The latter statement is true but should be considered a qualification to the former: a peripheral rather than a central claim. To stress the sex difference alone would be like observing that male elephants are bigger than females while steadfastly neglecting to mention that all adult elephants are large compared to most terrestrial animals. It would almost certainly foster an inaccurate view.