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Do you have any idea why people kiss？Well down, the simple answer is just because it feels good. Our lips are full of sensitive nerve endings, which activate sensory areas in the brain. Kissing boosts the levels of neurotransmitter substances such as dopamine, serotonin, and oxytocin. Dopamine triggers craving and desire, serotonin elevates a person’s mood, and oxytocin is involved in forming emotional attachments.
你知道人們為何接吻嗎？問的好！人們接吻的原因十分簡單——它會讓人感覺良好。嘴唇上遍布著神經末梢，而神經末梢會激活大腦相應的神經區域。接吻能提高多巴胺，血清素及催產素等神經遞質物質的水平。多巴胺會刺激人的欲望，血清素會提升人的情緒，而催產素會引發強烈的感情歸屬感。
Besides humans, the only animals that scientists have ever seen kissing are our closest ape relatives, chimpanzees, and bonobos, and even then it is a rare occurrence. There must be a better explanation for it.
除了人類，科學家發現唯一有接吻行為的動物是人類的近親——黑猩猩和倭黑猩猩，即使在它們之中這種現象也極少發生。因此，人類要接吻應該還有更好的理由。
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