Generally speaking, the continuation of male arousal is based on the continuous stimulation of the penis and glans, which makes the sexual stimulation more and more high. Therefore, the male orgasm, is an ejaculation, strong muscle contraction 3-8 times, at most spend a 3-10 seconds that end. If we break down this 3-10 second ejaculatory action, it can be divided into two stages. The first stage is that the ejaculatory center of the lumbar medulla, which triggers the reflex response, transmits instructions to the smooth muscles of the walls of the paraphilias (paratesticular, seminal vesicles, prostate), causing the muscles to contract, at which time the prostatic fluid (seminal fluid) is transported from the paratesticular and seminal vesicles to the seminal ducts, along with the testicular secretion, which is the beginning of the reflex action of ejaculation in vitro. All of the above are functions of the autonomic nerve. When this level is reached, no pleasure is generated yet, but it is just a situation of “once it starts, it is inevitable”. If you continue to intensify stimulation, then you enter the second stage. At this time, the muscles at the base of the penis and the muscles hanging from the testicles (testicular lift muscle) contract at the same time, and because of the strong propulsive force, the semen is instantly righted. When the semen is ejaculated, the urethra swells by 2-3 times its size. Therefore, the bladder sphincter is closed and urination is not possible. Normally, 7-8 contractions occur at 0.8 second intervals, but with age, 3-5 contractions occur. If the muscles around the ejaculation and the muscles from the buttocks to the lower thighs also contract at the same time, this can bring men to the peak of sexual pleasure. In short, a man’s orgasmic ejaculation involves the entire urethra inside the penis contracting forward. Initially, the contraction occurs every 0.8 seconds and decreases after three or four times. At this point, the testicles, vas deferens, parametrium, seminal vesicles, and prostate gland also contract together, and ejaculation occurs. Ejaculation can be divided into two stages. The first stage is the contraction of the above organs and the forward displacement of the semen into the urethral area of the prostate. At this time, the sphincter at the bladder outlet is locked to prevent the semen from flowing backwards into the bladder. In the second stage, the semen is expelled forward to the urethral opening. Therefore, ejaculation is a kind of “once started, that is, inevitable” involuntary reaction, can not be stopped.