Human sperm are gradually transported from the head of the epididymis to the tail after testicular formation, which takes about 2 weeks, and further matures to make them capable of fertilization. There are species differences in the survival time of stored sperm in the tail of the epididymis, about 1-2 months in humans, not to mention that the testes are continuously carrying out sperm manufacturing and constantly transporting to the front, ensuring a sufficient source of sperm, and the sperm stored in the epididymis will not be tempted to wow the whole army for quick release. It is always retaining enough strength for the reproduction of the race, so ejaculation will not empty the sperm stored in the epididymis at once.