Puberty — things that change for boys Puberty — things that change for boys During puberty, your testicles testes or balls start producing the male hormone testosterone. This hormone triggers the changes in your body. Suddenly you will grow taller and begin to develop muscles. You will also find physical changes happening to your voice, your body hair and your genitals, and possibly even your breasts.
Testicles: 12 fascinating facts you never knew about balls | Metro News
Medical exams are usually pretty straightforward. Many parts of the exam make sense to most guys: The scale is used to weigh you, the stethoscope is used to listen to your heartbeat. For other parts of your body, the doctor's sense of touch and training are the key to knowing how things should feel.