The sperm arrive first at the ampulla, where secretions from the seminal vesicle are added. From the ampulla, seminal fluid is propelled forward through the ejaculatory ducts toward the urethra, passing first by the prostate gland, where a milky fluid is added to form semen. Finally, the semen is ejaculated through the far end of the urethra. 1. Sperm and semen are not the same thing. Spermatazoa, or sperm, is the name given to the reproductive cell that looks like a tadpole. Seminal fluid is the stuff that the tadpole swims in. Together they form semen — an armored tank carrying a fertilization superhero. The sperm regeneration cycle takes about 74 days. While most men produce millions of new sperm every day, it takes 2 ½-3 months for them to fully mature. While most men produce millions of new sperm every day, it takes 2 ½-3 months for them to fully mature.