Meiosis takes place in the testes, which are located in the scrotum. Sperm move from the testis to the epididymis, where they mature. Upon ejaculation, the sperm move through the vas deferens and then to the urethra. The seminal vesicles, prostate gland, and bulbourethral gland add fluids to form semen. The testes also produce testosterone, the male sex hormone.