Urethra : - A passage for urine to leave the body. Foreskin : - Skin that covers the tip of the penis. Circumcision : - A surgery to remove foreskin. Epididymis : - The epididymis is a long, coiled tube that rests on the backside of each testicle. It transports and stores sperm cells that are produced in the testes. Also the job of the epididymis to bring the sperm to maturity, since the sperm that appear from the testes are small and incapable of fertilization. During sexual excitement, contractions force the sperm into the vas deferens .