What Is the Physiological Process of Ejaculation?

Understanding the physiological process of ejaculation is helpful for developing new pleasures, controlling ejaculation time, and enjoying a longer orgasm plateau.

Ejaculation is the end of an orgasm plateau, which can be divided into two steps:

The first step is sperm transfer: When the sexual stimulation becomes extremely intense, the reflex center located in the 1st-2nd segments of the spinal cord sends sympathetic nerve impulses, which reach the genitals, and cause the ampulla of the epididymal vas deferens to contract and transfer the sperm to the posterior urethra, then the smooth muscle around the prostate contracts, and the seminal vesicles also contract to discharge prostatic fluid and seminal vesicle fluid, and push the semen forward.

The second step is ejaculation: The posterior urethra is stimulated by prostaglandin in the incoming semen and sends a signal, which is transmitted to the sacral segment of the spinal cord through the pudendal nerve, and then the spinal cord sends out rhythmic impulses to the sciatica cavernosa muscle and bulbocavernosus muscle to make them contract, which causes a rhythmic wave-like increase in the internal pressure of the erectile tissue, and ejects the semen through the urethra. During ejaculation, the bladder sphincter contracts and closes the passage between the bladder and the urethra, so as to prevent semen from entering the bladder or urine from entering the urethra. Ejaculation gives men intense pleasure. After ejaculation, the sympathetic nerve impulse causes the penile arteries to contract and the veins to dilate, the blood in the erectile tissue quickly decreases, the internal pressure drops and the erection disappears; after this, it is the refractory period, where erection and ejaculation cannot occur.