Every man and woman who has had sexual experience will notice that the semen ejaculated by a man has a strong and special smell. Some people are disgusted by this smell and say it is extremely unpleasant; some people find it fragrant and say it is refreshing and exciting. These two completely opposite feelings are closely related to physical and psychological factors such as the level of sexual desire of both parties, the depth of spiritual and physical integration, and attitudes towards sexual behavior. What scientists are interested in is, where does the smell come from, and what is the significance of its existence?

Semen, like saliva, gastrointestinal fluid, blood, etc., are all body fluids of the human body, but only semen has the most distinctive smell. Semen is not a pure fluid like other body fluids, it is a mixed fluid. In addition to sperm, other seminal plasma components in semen are composed of prostatic fluid, epididymal fluid, seminal vesicle fluid, and various secretions from the urethra and vas deferens.

The smell of normal semen is emitted by the oxidation of a chemical called arginine, which is very similar to the smell of chestnut flowers. Arginine is one of several important components contained in prostate secretions. The oxidation of ammonia must involve seminal vesicle fluid. Prostatic fluid obtained through rectal massage generally does not have the smell of natural ejaculated semen.

It can be seen that the smell of normal ejaculated semen comes from the prostate, but it is emitted with the participation of seminal vesicle fluid. The lack of this special odor in semen often indicates damage to prostate function, and many prostate patients often cannot smell this odor in their semen.

As for the physiological significance of the special smell of semen, it is speculated that it may be related to sexual desire and sexual behavior. In lower animals, information about sexual activities and sexual selection between the sexes mainly relies on smell; many mammals emit a special smell during the estrus period to attract members of the opposite sex. Although humans have expanded access to sexual stimulation during evolution, the sense of smell has given way to vision in sexual selection.

However, in recent years, scientists have discovered many secreted substances in the human body that can affect the sense of smell of the opposite sex, indicating that the sense of smell may still be one of the important sexual sensory organs of the human body, and it is necessary to conduct in-depth research.

As for the smell of semen, it is not necessary to eliminate it, and it cannot be eliminated. It is natural to love cleanliness, but it is obviously an outdated concept to regard sex and semen as "dirty" things. In addition, people who love cleanliness are warned that excessive use of "external substances" such as deodorant or perfume will cause you to lose the sexual charm of your natural body odor.

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