he testicles (aka balls) are your body's sperm factories. During puberty, your testicles start making and storing sperm, which they will make 24/7 for the rest of your life. The testicles have a lot of work to do! They also make testosterone - a hormone that gives you facial hair, bigger muscles, a lower voice, and sex drivehe testicles (aka balls) are your body's sperm factories. During puberty, your testicles start making and storing sperm, which they will make 24/7 for the rest of your life. The testicles have a lot of work to do! They also make testosterone - a hormone that gives you facial hair, bigger muscles, a lower voice, and sex drive.. The scrotum is usually a little darker than the rest of your skin, but not always. Some people have a longer scrotum that hangs lower, while others sit a little higher. The scrotum is usually wrinkled and covered in hair. Many people have many tiny, painless bumps on the scrotum or penis shaft. These are called Fordyce spots - they are completely normal and do not cause any health problems.