Why do men and women kiss?

Because kissing is an intoxicating way to express love. However, while enjoying the good times of interdependence, who would think of the dry chemical words 5- hydroxytryptamine, phenylethylamine and adenosine triphosphate? How many couples who are in love know that kissing is not only good for health, but also makes people more attractive?

The ancient Roman poet said, "Kissing is a meadow full of flowers in summer"; Shakespeare said, "Kissing is the mark of love". Sculptors like Rodin, painters like Klimt, and countless writers, poets, photographers and film directors have left immortal masterpieces for the world around the theme of kissing. Today, scientists also have something to say about kissing.

Double lip ignition chemical reaction

Kissing can make people's hormonal fire burn violently. What is the chemical secret? The scientific community began to pay attention to this problem about 30 years ago. In recent years, with the rapid development of biochemistry and neurophysiology, new research fields have been opened up-how emotions are generated, how feelings or memories stimulate emotions, how emotions affect our behavior and so on. The researchers also found that for desire and passion, it is more the result of the interaction between hundreds of billions of nerve cells and thousands of transmission substances.

When the human body receives attractive kissing signals, the release of serotonin, a happy hormone in the brain, can make a person more relaxed and calm. Subsequently, phenyl ethylamine-phenylethylamine, like an arrow in Cupid's hand, played a role in fanning the flames, causing people to have sexual desire and ecstasy: the heart was pounding, the whole body was feverish, blood pressure rose, sweating, saliva increased, and a heartfelt and thrilling feeling filled the body and mind. At this time, the production of adenosine triphosphate, which is greatly mobilized, provides the human body with the energy it needs and makes the heart beat faster.

Gian Gessa, head of the Department of Neurology at Cagliari University, explained: Before a couple's lips touch, the desire and expectation for contact begin to activate neurons in the brain. Entering the kissing stage, touch and smell strengthen the stimulation to neurons, and dopamine can make cells produce the neurotransmitter dopamine. When dopamine is released and diffused in the brain, a sense of pleasure arises spontaneously. This is why couples feel happy when they kiss. The same mechanism works when people taste chocolate, or when addicts "smoke a cigarette after a meal".

So, what profound influence will a affectionate kiss have? "In a good kiss, you will groan, and your brain will be empty, because the blood will flow faster in the blood vessels and the blood supply to the head will be reduced. You can't think at this time. " This passage is selected from the guide to love published by Hugh Morris 1936. If the two people kissing are congenial adult partners with good sexual and psychological qualities, then the effect of kissing is tantamount to a surge in amphetamine. Dopamine began to flow rapidly around the brain, the secretion of testosterone in both sexes increased, and adrenaline and norepinephrine were secreted by adrenal glands, which increased blood pressure and the heartbeat soared from 60 80 beats per minute to more than 100. The capillaries under the skin of the lips are congested, and the lips become red and swollen, which is very sexy (this is the reason why red lipstick is popular). In an unusually passionate kiss, the pituitary gland at the bottom of the brain secretes vasopressin. Scientists believe that this magical hormone can stimulate us to form a love relationship, and it can also help childbirth and stimulate women to secrete milk.

That's what scientists say about kissing

Kissing seems simple, but it drives the activities of many tissues and organs of the body. "Compared with the movements of the upper and lower limbs, the accuracy of lip movements is unbelievable." Professor Gus Magrut, director of plastic surgery at University College London, said. He studies how to correct oral defects by kissing. "This is good exercise. When you kiss, many muscles on your lips contract. The levator muscle vertically distributed in the lip lifts the lip and makes it protrude forward and outward. At the same time, the orbicularis oculi muscle is closed, which is distributed around the lips in a ring shape. These muscles coordinate their movements so that the lips can protrude and kiss. There is a transverse muscle inside each cheek, called buccal muscle, which is distributed from the mouth to the ears. When it tightens, it can control the position of the lips. "

Lucia Rosa Cantafio, a psychologist of the Italian Clinical Society, explained: "Culture has a decisive influence on the meaning of kissing. In Europe, kissing marks the beginning of an emotional relationship. This is the prelude to the song of love, a way of contact before sex. For Americans, kissing is a sexual gesture and a confirmation and affirmation of sexual relations. However, cultural factors do not affect the importance of kissing. In all societies, kissing can be recognized from an instinctive perspective. Kissing is the best emotional thermometer for two people, and the touch of lips is the closest contact to the depths of the soul, because it covers all feelings and is more important than real sexual relations. "