Scientists have recently discovered that kissing can change the chemical composition of the body, rub the lips and exchange saliva, and change the oxytocin level released by the brain into the blood. This oxytocin is a hormone that can make people feel more intimate.

Why do people like kissing?

The simplest answer is "this feeling makes me very comfortable". But this explanation is not sufficient. Some people have studied anatomy and the evolutionary history of kissing, calling themselves kissing experts. But so far, these scientists who study kissing have not explained clearly how people kiss, but they have put forward several theories to reveal how passionate kissing affects our bodies.

An important question is whether kissing is acquired or an instinct. Some people say that it is a learning behavior, and our ancestors can kiss. At that time, the mother chewed up the food first and then sent it to the baby's mouth with her mouth. Even if the child has a broken tooth, the mother will still kiss the child's lips to show comfort.

There is a fact that not everyone can kiss, which supports the conclusion that kissing is acquired rather than instinct. Anthropologists say that tribes in many parts of the world don't actually kiss. Statistics show that 90% people kiss, while 10% people don't kiss at all.

Others believe that kissing is an instinct and take kissing-like behavior of animals as evidence. Most animals show their love for each other by rubbing their noses repeatedly, while other animals like to express their feelings with their mouths just like people. For example, bonobos exchange saliva to express their deep apologies. After the war, they all did this when comforting each other and developing social relations, and sometimes they kissed inexplicably like human beings.

Nowadays, the most recognized reason for human kissing is that it can help us find the right partner. When men and women's faces are close together, pheromones will convey biological information about whether they will have strong offspring. For example, women prefer men whose immune system protein genes are different from their own, which may give birth to offspring with stronger immune system and higher survival probability.

Most people are satisfied with the explanation that feeling good is the reason for human kissing. Human lips and tongue are covered with nerve endings, which can help human beings enhance the wonderful feeling of love when kissing. Although kissing is beautiful, it usually doesn't make us think about why we kiss, but it only makes us look for more ways to kiss.

So why do people kiss? Scientists have recently discovered that kissing can change the chemical composition of the body, rub the lips and exchange saliva, and change the oxytocin level released by the brain into the blood. This oxytocin is a hormone that can make people feel more intimate.

Interestingly, oxytocin is also released during childbirth, which is considered to be closely related to newborn babies and mothers. Scientists also found that in the kissing competition, women released less oxytocin, while male partners released more. Scientists don't know why there are such differences between men and women.

In addition to the changes in oxytocin levels, scientists also found that after kissing the beloved in the 15 minute kissing competition, the release of stress hormone cortisol-stress hormone-decreased, which will increase the happiness of lovers. Wendy Hale Hill, a professor of neuroscience at Lafayette College in Pennsylvania, said: "There are very few people who study kissing at present."

Helen Fisher, an anthropologist at Rutgers University in New Jersey, said that kissing can stimulate any of the three main brain systems involved in mating and reproduction (sexual desire, romantic love and long-term attachment): "Sexual desire urges you to find a series of partners; Romantic love encourages you to concentrate your mating energy on only one person at a time; Attachment encourages you to stay in a relationship long enough for both men and women to spend their infancy together. "

By kissing, you can also smell whether the other person's teeth are healthy, what the other person likes to eat, and whether he smokes. Based on this, we can get to know a person and then decide whether we can continue to do other things with each other, such as having sex.