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For normal sperm development, the testes must be at a temperature slightly cooler than the body temperature. Approximately to million spermatozoa also called sperm or spermatozoans , produced in the testes, are released per ejaculation. The dartos muscle is a layer of smooth muscle fibers in the subcutaneous tissue of the scrotum surrounding the scrotum. This is most commonly caused by benign prostatic hyperplasia BPH. The ejaculatory ducts empty into the urethra. Seminal plasma, in turn, is produced by contributions from the seminal vesicle, prostate, and bulbourethral glands.