A study in Australia ran a computer simulation that showed how assortative mating (the preference for romantic partners similar to oneself) arises spontaneously when heritable traits and heritable preferences for mates become associated through generations. The simulation showed that the heritability of mate preferences and preferred traits is sufficient to produce assortative mating without any other mechanisms. The paper was published in Psychological Science. Assortative mating is the tendency for individuals to choose partners who are similar to themselves in important traits, such as education, height, personality, or values. It is observed in humans and many animal species, making it a widespread pattern in nature. People tend to resemble their partners more than would be expected by chance. While this similarity can make communication and cooperation easier—whereas a large mismatch in vocabulary, cognitive capacities, or interests can make communication difficult—the study suggests these benefits are not necessary for the pattern to emerge. In humans, assortative mating frequently occurs regarding socioeconomic status. It can also happen for psychological traits, such as intelligence or mental health vulnerabilities. …