Ejaculation is a reflex action of male animals during sex. For human beings, ejaculation is to shoot semen from penis through a series of coordinated actions of various parts of reproductive system. It includes two steps of spinal cord reflex, the primary center is in lumbosacral spinal cord, and its sensory impulse is introduced by the tactile receptor of penis glans. The first step is that sympathetic efferent impulse contracts the smooth muscles of vas deferens and seminal vesicles, and the semen in vas deferens and seminal vesicles is transferred to urethra. The second step is to contract the striated muscle at the root of the corpus cavernosum with the help of the efferent impulse of the pudendal nerve, so that the semen in the urethra can be ejected. The excitement of the higher parts of the brain also plays a role in the erection center and ejaculation center of the spinal cord through the descending pathway. The sexual excitement of normal people comes from various senses and affects the spinal cord reflex activity through the brain. Ejaculation is a complicated process, including erection, ejaculation, ejaculation and orgasm. Erection is caused by swelling and hardening of penis, and its main innervation comes from sacral plexus and pelvic visceral nerve or erectile nerve. Ejaculation involves collecting semen before ejaculation and delivering it to the urethra and prostate. With the closure of bladder neck and distal urethral sphincter, urethra and prostate become sperm storage pool. This will induce ejaculation, that is, semen is ejected rhythmically through urethra, and the participation of perineal skeletal muscle is essential in this process. Orgasm is a kind of brain participation, usually a pleasant thing, which is closely related to ejaculation. The neurophysiology of ejaculation is only partially understood. Studies have shown that the dopaminergic system promotes ejaculation, while the serotonin activation system inhibits ejaculation. The main neural mechanism of ejaculation is the innervation of the body, but it also includes nerves and fibers from the pudendal autonomic nervous system. The autonomic nerve branch of parasympathetic nerve mainly controls erectile function, while the nerve branches of sympathetic nerve and body mainly control nocturnal emission and ejaculation. In the process of sexual behavior, sensory stimulation is transmitted from genitals through sensory branches of pudendal nerve (belonging to somatic nerve) and reaches spinal cord through sacral plexus. The exact location of ejaculation control is not clear, but the hypothalamus is thought to be related to it. Stimulating impulses from the ejaculation center in the brain reach the sympathetic trunk of the spinal cord, and these impulses reach the scrotum, vas deferens, prostate and other organs related to male ejaculation through the nerve plexus of the upper and lower abdomen and the lower abdominal nerve. The sympathetic nerve innervating the bladder neck closes the bladder neck, which is necessary to prevent retrograde ejaculation. Nerve information, whether from the higher center or spinal cord reflex, is transmitted to the striated muscles of sacral plexus and perineum through the motor branches of pudendal nerve, thus causing ejaculation characterized by rhythmic contraction. These muscles include the ischiocavernous muscle and the bulbocavernous muscle. Ejaculation, the basic vital sign of maintaining sexual harmony, is simply the vital sign of semen shooting from urethral orifice, and it is the most basic life phenomenon to maintain human (even biological) sexual harmony and make life continue and renew. For the sake of health care, it is necessary for us to subdivide ejaculation into effective ejaculation and ineffective ejaculation. The ejaculation that can naturally enter the vagina is called effective ejaculation, otherwise we should call it invalid ejaculation. This is often called impotence and premature ejaculation. With the strengthening of human life activities and the increase of pressure, both men and women are facing increasing competition and pressure from the needs of survival. Whether it comes from heart or body health problems, it may affect the success or failure and quality of ejaculation. So I think the discussion and research on ejaculation should be analyzed and discussed from a healthy perspective. Not picky about food and partial eclipse are the simplest and most basic ways for children to maintain human health; Of course, for white-collar workers with increasing competitive pressure at present, this point should be particularly emphasized! From the perspective of mental health, I think we should treat some sensitive topics such as sex, relationship between men and women, ejaculation and so on with a normal heart. Talking about transsexuality should have been thrown into the garbage dump of history a long time ago. We should be very clear that ejaculation is only the latest vital sign of human life and health activities. This is normal. If ejaculation must be attributed to a desire for a certain purpose or purpose, I think it should also be an instinctive driving factor for survival. Only in this way can we easily and naturally treat our human life phenomenon, which is different from ordinary animal behavior (monogamy)! In short: health is the foundation and sexual harmony is the goal. Sexual harmony and social harmony. The chain of men's sexual behavior is like a left program. First, when men are sexually impulsive and excited, the blood flowing into the penis greatly exceeds the blood reflux of the penis. As a result, the cavernous body of penis stores a lot of blood, and the pressure increases, making the penis hard and erect, becoming thicker and longer. Second, the muscle fibers of the scrotum wall contract, which makes the scrotum bulge together with the testicles inside and get closer to the body. This is similar to the reaction of scrotum when it is stimulated by cold. Third, the penis is slowly inserted into the vagina from shallow to deep. At this time, the mutual hug is closer. As the root of penis goes deep into women's body, the body image space of both sexes shrinks to a minimum. Fourth, the penis is in close contact with the female vagina, and after being stimulated by friction, sexual intercourse enters a continuous period. The penis is further congested and swollen, dark red, and the scrotum is closer to the body. Testicles can also swell due to blood vessel congestion. There is a small amount of mucus overflowing from the urethral orifice. Some people will have a flush on their abdomen and chest. Fifth, after the penis and vagina are constantly rubbed, most men reach orgasm within 2-6 minutes, and ejaculation reflex occurs. Ejaculatory reflex is irreversible and unstoppable after being stimulated. Ejaculation is intermittent, the interval is less than 1 s, and it lasts for about 4-5 times. With ejaculation, there will be slight muscle twitching. Heartbeat, respiration and blood pressure all peaked. Some people have deeper blushes. Sixth, after ejaculation, the body began to recover. Various physiological changes quickly recovered: the penis shrank sharply and the scrotum returned to normal. The shrinking penis involuntarily slipped out of the vagina and entered the refractory period of men. Seventh, after the penis exits the vaginal orifice, men will have fatigue reaction behavior. The muscles of the whole body relax, fatigue is obvious, sometimes accompanied by slight dizziness, eyes closed, and soon fall into a deep sleep state.