Ejaculation and semen leakage is a natural phenomenon that occurs in all males at the stage of sexual development and maturity. Males usually start their sexual development gradually from about 13 years old, and the phenomenon of seminal emission will occur earlier when they mature early. Because of the process of male sexual development, the testicles will secrete androgen, androgen stimulation, resulting in men have more interest in sex-related things, but also sexual fantasies, contact with sex-related words and pictures, there is no reasonable sexual release, when the seminal vesicles to store a certain amount of semen, the penis erect at night, and the underwear friction, there will be a sexual stimulation, and these sexual stimulation will produce a sexual impulse, and the phenomenon of spermatozoal emission will occur. Phenomenon.