It is normal for a 20 year old man to normally ejaculate 2 to 3 times a week. If the number of ejaculations is too much or too little, it will be detrimental to one’s health. Ejaculation refers to the external force on the penis to continuously strengthen the stimulation, so that the reproductive system of the pipeline, glands and muscles to release a strong nerve impulse, the semen by the urethra discharged process. 20-year-old man is in the stage of androgen exuberance, the sexual desire is relatively strong, usually a week of ejaculation 2 to 3 times belong to the normal physiological phenomenon. If a 20-year-old man ejaculates more times a week, it may cause mental ill-health, loss of libido, or even cause premature ejaculation, which will have a certain impact on men’s health and daily life. If the number of ejaculations a week is low, it may make the semen and prostate fluid stagnant, which may induce prostatitis, seminal vesiculitis and other diseases. Due to individual differences, the number of ejaculations a week for a 20-year-old man cannot be generalized, and it is recommended to control the frequency to avoid abnormalities. If accompanied by uncomfortable symptoms, such as ejaculation pain, ejaculation delay and other phenomena, you should seek medical examination.