Balls are officially called testicles and you have two of them. They sit together in a bag (called a scrotum) that hangs outside the body. One will hang a little lower than the other which prevents them banging together (a very painful experience) when you run. The skin of your scrotum is darker than the skin on the rest of your body and when you’re going through puberty it will grow hair.
It’s the job of the balls to make the sperm and each testicle can produce about 2000 sperm per second so you’ll never run out. Sperm needs to be kept cooler to live so that’s why your balls hang on the outside of the body. Hotter temperatures, as would be found if they were stored inside you, would damage and kill sperm. To help keep the sperm at a healthy temperature the skin of your scrotum will contract and expand. It will contract and look wrinkly if it’s colder and then look smoother when it’s warmer. A long tube takes the sperm from your balls to the penis. The tube also takes urine from your bladder for you to pee and it’s called the urethra.
Ejaculation is the technical term for what happens when man has an orgasm (when he comes). The muscles at the base of the penis contract hard and semen spurts out. Each contraction of those muscles lasts about 1 second and you can have anywhere between three and about 15 of those each time you have an orgasm. Semen is a milky liquid which contains the sperm and it only takes one of them to fertilise an egg. Each time you come you produce about a teaspoon of semen which contains about 300 million sperm! Semen can be thick or thin and sometimes semen can pump quite far, other times only dribble out.
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