Helen Fisher tells us why we love + cheat on TED

Love's all in the brain: fMRI study shows strong, lateralized reward, not sex drive

 "Humans have evolved three distinct but interrelated brain systems for mating and reproduction – the sex drive, romantic love, and attachment to a long term partner," Fisher said, "and our results suggest how feelings of romantic love might change into feelings of attachment. Our results support what people have always assumed – that romantic love is one of the most powerful of all human experiences. It is definitely more powerful than the sex drive."

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