"perm cells are produced within the testicles in densely coiled tubes called seminiferous tubules (say that 10 times fast!). After this step (called "spermatogenesis"), sperm hang out in the epididymis (a series of ducts behind the testes), where they mature for about one day. When sexytime comes around, sperm conga-line through the vas deferens, the ejaculatory ducts, and finally out through the urethra. But that’s not all, folks! A lonely little sperm cell without any help or protection would never get to the endzone."
See more @ Greatist