What about spermatorrhea last night? Male ejaculation usually occurs suddenly without sexual intercourse, which is called spermatorrhea. Spermatorrhea is mainly because the male testis is the organ that produces sperm. With the growth of age and the maturity of reproductive organs, the testis always produces sperm. The seminal vesicle and prostate also secrete seminal plasma. Semen accumulates in the body and is discharged from the body through spermatorrhea when it reaches saturation. It is common in adolescent males, because the central nervous system gradually matures after puberty, which activates the reproductive axis of hypothalamus, pituitary and testis, and stimulates the secretion of androgen.