人类为什么会接吻?Why do humans kiss_ - BBC REEL

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Whether their hype has been inflated by romantic movies, or they really are a good way to know if someone is The One, we put a lot of value on a first kiss.

But why is kissing so special?

One idea is that as babies we have an innate liking for lip-touching.

From breastfeeding onwards, we associate our lips with positive reinforcements.

There is a suggestion, and bear with me on this, it s not very pleasant, that we're specifically fine-tuned to like lip-on-lip kissing because, back in our evolutionary past, after weaning our mothers would chew our food for us and then transfer it into our mouths.

This is called premastication food transfer and is a known behaviour in our great ape relatives.

Thankfully, we now have baby food.

Secondly, our lips are very sensitive, in fact they are one of the few very sensitive parts of us that we don't cover with clothes.

The more clothes you wear, the greater the frequency of kissing.

The less clothes you wear, the lower the frequency of kissing.

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