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Nature programmed the neurobiological processes of early love to appear as something beyond the primitive sexual cravings of the genitals. So, from an evolutionary standpoint, it all leads to copulation and reproduction, but from the perspective of the individual who has recently fallen head over heels in love with someone, it is mostly about a sensation of warmth and delight, and rarely of sexual nature.
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Abhijit Naskar (Love, God & Neurons: Memoir of a scientist who found himself by getting lost)