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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.

Thus, a curious fact about natural selection is that, even though it’s a completely mindless process – a process without foresight or understanding – it has given rise to creatures that have minds, that have foresight, and that even have some basic understanding of the universe of which they’re a part.

[A]lthough we agree that caution should be exercised in discussing biological explanations, we would argue that this is a specific instance of a more general truth, namely that caution should be exercised in discussing any explanations. It is not only biological explanations that can undergird harmful practices. Environmental theories of left-handedness and same-sex sexual orientation, for instance, have been associated with cruel and unnecessary interventions designed to eradicate these innocuous traits. Environmental theories of human sex differences, if taken to extremes, could potentially produce comparable harms. For example, if we assume that sex differences in career choice are necessarily evidence of bias and barriers, and never products of the freely made choices of those best-placed to make them, we may pathologise the decisions of individuals who take a gender-typical path, and enact progressively more coercive practices to eliminate the remaining gaps. Like earlier efforts to force people into the mould of traditional gender stereotypes, such practices may mean that some people are funnelled into careers that do not align well with their interests and inclinations.

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The evidence for bias in STEM is mixed: Although some studies find bias against women, others find none or bias in women’s favour... The mixed findings suggest that narrow-sense anti-female bias is less ubiquitous than sometimes assumed – or that different people have different biases, and these sometimes favour males but sometimes favour females.

[W]e should strive to eliminate bias and barriers of every kind... What we would argue, though, is that even if this were achieved, STEM gender gaps would be unlikely to disappear given persistent sex differences in interests and other STEM-relevant traits – differences plausibly due in part to biological causes. The question, then, is: Would this necessarily be a problem? In our view, as long as unjust impediments are removed, and everyone is invited, it would not be. On the contrary, it would be unfortunate if, for all the talk of celebrating differences and diversity, we ultimately came to insist that justice requires sameness.

For much of the 20th century, the blank slate view was the dominant view in the social sciences. With the popularization of sociobiology in the 1970s, however, evolutionary approaches to human behavior became the locus of an academic culture war between biologically minded thinkers and advocates of the traditional social science model.

If we decide – and this is our decision; it’s not imposed on us from above – if we decide that reducing the amount of suffering in the world is a good ethical principle to live by, then it becomes entirely unjustified and arbitrary to extend this principle to human beings but not also to extend it to other animals capable of suffering. Why should the suffering of nonhumans be less important than that of humans? Surely a universe with less suffering is better than one with more, regardless of whether the locus of suffering is a human being or not, a rational being or not, a member of the moral community or not. Suffering is suffering, and these other variables are morally irrelevant.

The amount of suffering and pain caused by the tyranny of human beings over other animals (particularly in food production) far exceeds that caused by sexism, racism, or any other existing form of discrimination, and for this reason, the animal liberation movement is the most important liberation movement on the face of the planet today.

Based on the foregoing discussion, we suggest that the approach that would be most conducive to maximizing individual happiness and autonomy would be to strive for equality of opportunity, but then to respect men and women’s decisions regarding their own lives and careers, even if this does not result in gender parity across all fields. Approaches that focus instead on equality of outcomes – including quotas and financial inducements – may exact a toll in terms of individual happiness. To the extent that these policies override people’s preferences, they effectively place the goal of equalizing the statistical properties of groups above the happiness and autonomy of the individuals within those groups.

As far as we know, no woman in the history of the species has ever given birth and thought: “Wait a minute! How do I know that this baby is mine and not some other woman’s?” In contrast, if a baby comes out of the body of a woman you slept with nine months ago, that’s not nearly as reliable a clue. As an old saying has it, maternity is a matter of fact, paternity a matter of opinion.