Ejaculation is a normal phenomenon. As men grow older, the androgens secreted by the testes in the body cause the development of secondary sexual characteristics to become more and more obvious. Due to the secretion of androgens, male patients begin to have sexual thoughts and desires. The testes develop to a certain extent and produce sperm. The sperm is stored in the seminal vesicles without reasonable sexual release, so that there is sexual excitement at night and the penis will become erect, and this condition results in seminal emission. Generally, seminal emission once a week is fine. When men develop and mature, they will have sexual fantasies, and they will have erotic dreams at night.