The testes are where sperm is made. This begins once puberty has started. Testes grow bigger during puberty and come in different shapes and sizes. Sometimes one testis is larger or hangs lower than the other. This is all normal.
The scrotum is the skin that holds the testes on the outside of the body. This skin is usually a bit darker than the rest of the skin on the body and may have pubic hairs on it.
The vas deferens is the tube that carries the sperm from the testes to the prostate gland.
The prostate gland is where sperm are mixed with fluid called semen. The prostate gland is also involved in ejaculation.
The urethra is a tube with a small opening at the tip of the penis. It can carry urine from the bladder, or semen (containing sperm) from the prostate. There is a valve that can block off one or the other, so a person can’t urinate and ejaculate at the same time.