Human romantic love is a puzzling anomaly. Long-term monogamous relationships are exceedingly rare among animals; indeed, less than 3% of mammals form monogamous relationships. So why are we the exception? The dominant theory holds that love is an evolved adaptation that contributed to our survival as species. The shift to walking upright changed our ancestors’ pelvic structure in a way that narrowed the birth canal in females, and necessitated that newborns be very small. Human babies are extremely helpless at birth and take a long time to mature sexually, so they benefit greatly from the continuous care and dedication of both parents. Love, in short, is a commitment mechanism that encourages the mom and dad to stay together and raise a healthy, sexually mature individual that can successfully pass on their genes1. So if you sometimes feel like a fool for love, remember that it’s in your nature.
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