During a kiss, the sensitivity of the lips triggers the brain to produce a "chemical cocktail" that brings about feelings of euphoria. This cocktail is made up of three hormones: dopamine, oxytocin, and serotonin.
(Vietnam+)
Source: https://www.vietnamplus.vn/kham-pha-nhung-loi-ich-bat-ngo-cua-hon-post1048106.vnp
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