There are reasons to conclude that romance as well was shaped by the unsentimental hand of evolution. We humans don't have a monopoly on oxytocin and other molecules linked to feeling in love. Love may switch on reward pathways in our brains, but other animals have similar--if simpler--reward pathways too.
In her experiments, Haselton finds evidence for love as an adaptation. She and her colleagues have people think about how much they love someone and then try to suppress thoughts of other attractive people. They then have the same people think about how much they sexually desire those same partners and then try again to suppress thoughts about others. It turns out that love does a much better job of pushing out those rivals than sex does. Haselton argues that this effect is exactly what you'd expect if sex was a drive to reproduce and love was a drive to form a long-term commitment.
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