Everyone secretes a hormone (generally, we transliterate it directly as hormone) to form their own unique physiological smell, which is usually called body fragrance, and professionally called pheromone or pheromone. In the Journal of the National Academy of Sciences in the United States, the research team from Karolinska University Hospital in Sweden confirmed through experiments that there are hormones in human body odor that attract lovers, which will directly cause the human brain to react and produce sexual impulses. AND they extracted two kinds of testosterone derivatives, called "AND and EST". The former is a variant of testosterone, which is secreted by male sweat, while the latter is related to estrogen and mainly exists in female urine. This kind of fragrant smell released from the human body is generally invisible to oneself, and only others can deeply feel it, especially the opposite sex. When these smells are mixed with sweat and secreted, the effect on the opposite sex is wonderful. As early as 1986, biologists and endocrinologists discovered the hormones secreted by human armpits: if the sweat in human armpit secretions is removed, the remaining substances are basically substances containing hormones. It is now possible to synthesize hormones artificially in the laboratory. With the improvement of the second characteristic, the physiological odor of these individuals containing hormones gradually appears after puberty. When the right sexes meet, they will be attracted by this almost imperceptible smell. After the opposite sex smells these smells, it can stimulate the respiratory center, thus speeding up the breathing process, making the brain adequately supplied with oxygen, and finally causing excitement. Many research results have verified the attraction of hormones to the opposite sex. The University of London designed an experiment to make female students receive hormone stimulation. In this way, the proportion of these female students and male students in continuous communication has greatly increased. On the contrary, put the worn and undressed T-shirts of boys side by side in the box, and girls prefer the worn ones. This is a very effective and famous experiment, which has been done many times in different laboratories around the world. The conclusion is similar. Experiments in German bars also show that twin sisters wear the same clothes, while older sisters use hormones, while younger sisters never use them. After basically excluding the appearance factor, the older sister who uses hormones is more attractive to the opposite sex. Hormones increase sexual attraction by 80%. Regardless of the outcome, the role of smell is ultimately directional and reproductive, which is of course the main purpose of mate selection. The legendary story of the famous Emperor Qianlong and "ChristianRandPhillips" is a vivid case. Napoleon also said in his letter to his wife that he would come back in a few days, and specifically told his wife "Please don't take a bath". From ancient times to the present, different things, different times, different races and different individuals have different preferences for body odor. But the same thing is that men and women who love each other are single-minded about the smell of their lover, feel refreshed and arouse their infinite tenderness. They will easily distinguish their own and special smells from many smells, even if they are "smelly" to others, or the people they smell look so "not up to grade". This is why we always sigh that "flowers are inserted in cow dung". Lovers can get sexual satisfaction from their sense of smell, which some scholars call olfactory love. Now European and American men and women pursue a primitive musk smell similar to human body smell. They think this smell is full of sexual elements, which can greatly increase their sexual desire. Two of a kind is a part of sex. True love is based on mutual attraction. This is not only a social phenomenon, but also a physiological law. Of course, if you are in an environment where the same sex is concentrated and there is no smell of the opposite sex, it may cause trouble. For example, in the same-sex concentrated working environment, even if all the conditions are excellent, both male and female employees are easy to feel tired and the work efficiency is not very high. However, if a few beautiful young people of the opposite sex are arranged, the situation will be greatly improved, and the enthusiasm, enthusiasm and efficiency of employees will be significantly improved. Through research, it is found that people who are isolated from the opposite sex are prone to impatience, anxiety and depression. At this time, as long as there is a faint smell of the opposite sex spreading in it, anxiety will turn into calm, and the agitated mood will return to calm. This applies to men and women. For example, astronauts in the space station often have inexplicable headaches and general discomfort. Later, with the addition of a female astronaut, these symptoms disappeared on their own. Editing this paragraph, these smells are almost invisible, so how do we capture and accept them? People's nostrils have a special organ near the bridge of the nose, called a "nose plow". With the aid of electron microscope, it can be observed that this small organ is bag-shaped and about 2 mm long. Its characteristic is that it only accepts sexual smell, and does not accept the familiar smell of spring flowers or public toilets. It can easily distinguish the sexual taste of armpit or groin among many very intuitive smells. After these sexual smells are emitted, people usually feel that they don't smell anything, but unconsciously, the sexual smell you love has penetrated into your brain, making you react quickly without thinking. Some scientists speculate excitedly that this organ is a sixth sense or intuition that has been difficult to find. For a long time, the orthodox school thought that this "mate-choosing organ" of human beings had already degenerated and could not perceive any smell. Some scientists even deny the existence of this organ. But now scientific discoveries are gradually confirming the existence and significance of the vomeronasal device. When people are stimulated by heterosexual hormones, the vomeronasal organ at the tip of the nose can convert hormone signals into electrical signals and transmit them to the central nervous system, thus regulating people's sexual behavior. What smell will affect our concept of mate selection? With the great development of molecular biology today, it seems that any conclusion can be traced back to deep genes. Clinique, director of the School of Brain and Biology at the University of Chicago, led a group of scientists to reset that ancient and classic experiment, which is the T-shirt experiment we mentioned above. Only this time it is more rigorous and formal, and the most important and novel thing is the introduction of genetic analysis methods. Men of different ethnic backgrounds wear the same T-shirt for two consecutive nights, just to leave their unique personal smell on the T-shirt. At the same time, avoid eating food with pungent smell, and don't smoke, have sex, touch pets or other people, or even use soap without fragrance when taking a bath. Similarly, these smelly T-shirts were put in different boxes and sniffed by 49 unmarried and never pregnant female volunteers who volunteered to participate in the experiment. The control group consists of two T-shirts with everyday smells, such as cloves, bleach, cotton and cartons. Finally, women are asked to rate the sense of smell and choose the smell they like best and want to live with most. In fact, the women who participated in the experiment did not know where these smells came from, and no one even knew that these smells came from men. In this experiment, molecular biology technology was added to link the results with genes. Researchers have extracted the major histocompatibility complex gene (MHC) from men and women, which is one of many genes that control the immune system, represents individual specificity, and participates in organ transplant rejection and immune response regulation. At the end of the experiment, the researchers analyzed the results of female sniffing and compared them with the genetic characteristics of these men and women. The researchers found that the smell that women like is similar to that of men who are similar to their fathers according to the corresponding genetic characteristics, neither very close to women nor at all close to women. In other words, girls usually like to choose boyfriends who look like their fathers. Researchers believe that this gene matching system appeared in the process of human evolution. From the perspective of gene evolution, men and women with similar MHC have neither too many nor too few chances to have sex, which can prevent the danger of having too many or too few children. In addition, such a combination will have more and more favorable cultural and social conditions in cultivating children. Differences in gene characteristics can ensure that offspring have a healthy immune system, which is not exactly the same as their own genes. Because consanguineous marriage is not conducive to the next generation, all animals also have the physiological function of prohibiting sexual behavior between immediate relatives to prevent the birth of offspring of patients, so selection is conducive to reproduction. The experimental results show that this important physiological function is realized by smell. This conclusion has been published in the journal Nature and Genetics. However, some scientists support that people with different MHC will be more attractive. These scientists believe that MHC can help our immune system to distinguish between our own cells and foreign cells. The partner with the biggest difference from MHC can give birth to as many genetically excellent offspring as possible, and the child's immune system is more extensive and can better adapt to the living environment. Of course, they don't object to this choice by smell, because different MHC genes will produce different smells. Especially in rodent experiments, this basic hypothesis has been confirmed. For example, male and female mice choose their mates by smelling each other's urine. Therefore, they always choose the opposite sex with different MHC genes for mating. In fact, there are many records about women's body fragrance in this paragraph, but it is always difficult for everyone to say why. There is a theory that the human body can store and release its own sexual taste, which is the result of the action of estradiol ketone in men and women. There is also a theory that there is a component called butyrate in the sweat secreted by the human body, and only its concentration is moderate, which is the unique body fragrance of women. So, where does the body fragrance of women come from? Hunan women have existed since ancient times, and there are many documents. The fragrance varies from person to person and from country to country. In fact, Xiangnv in Wuhan is not unique, and there are many records in China literature. The most famous one is Yang Guifei, the four beauties in the history of China. The doctor of Yue took a fancy to the appearance and fragrant body of Quarrel Jun, and chose him as a gift to Fu Cha, the king of Wu. The king of Wu specially built a fragrant stream and a fragrant path for the waiter, and played with the waiter in a fragrant atmosphere every day. As for Yang Guifei, the literature records that in the twenty-eighth year of Kaiyuan, the sixth generation emperor of the Tang Dynasty, Emperor Xuanzong, was lucky in the hot spring palace. When he met a Maggie, her fragrance was so strong that Xuanzong fell in love with her and took her for himself. This woman is Yang Yuhuan. Yang Guifei has a lot of sweat, and sweat can soak incense handkerchief. Xuanzong thought she was sweaty and built an agarwood pavilion for her. Li Bai was once asked to write a poem about Qingping Music. In the poem, "a red dew condenses fragrance" and "the fragrant pavilion leans against the railing in the north" all highlight a fragrant word. In addition to these two beauties, ChristianRandPhillips in the Qing Dynasty was also a well-documented glamorous woman. It is said that she has a fragrance, and she can smell it spontaneously without perfume. ChristianRandPhillips is from Kashgar, Xinjiang. She was fascinated by Qianlong because of her strange fragrance, and was named ChristianRandPhillips. She spent 28 spring and autumn years in the palace. The body fragrance of exotic beauty charmed a dried dragon, which shows how attractive the fragrance is. In foreign countries, there are actually many attractive women. A beauty center in Brussels once invited women from 10 countries to do an ingenious body odor test. Let them scrub their bodies with special soap first, then let them exercise and sweat, and then use relevant instruments to detect them. The results show that these women have different smells in different countries. For example, French women smell of cheese, British women smell of lotus root, Swedish women smell of hibiscus, German women smell of fragrant wood, and American women smell of seaweed. There have always been different opinions about the source of body fragrance. There are also sexual incense, butyrate incense and eating habits. Wuhan Xiangnv once had an examination in Wuhan University People's Hospital. Experts found that the smell of her body was similar to sandalwood, and the source of the smell was thought to be the abnormal secretion of sebaceous glands. But in foreign countries, the cause of body fragrance has been difficult to determine. There is a theory that the body fragrance of a glamorous woman comes from the "sexual taste" contained and released in her body. This sexual taste is the result of the interaction between estradiol in women's diet and some chemical components, which usually changes with age, and becomes more attractive in the stage of youth development, especially the feeling of the opposite sex.