Boys and puberty

The bodies of boys and young men change a great deal between the ages of 10 and 18 as they go through puberty. Sexual development usually begins in boys when they are about 13 or 14.

Changes to your body will happen over time and the speed of change will be different for each person. It's normal for people to start developing at different times so try not to compare yourself to other people the whole time. You can expect the following to happen:

  • your voice deepens;
  • you grow taller;
  • your muscles develop and your chest gets broader;
  • your genitals (penis and testicles) grow larger;
  • your nipples can become sensitive for a short time and may have some swelling;
  • hair grows under your arms, on your legs, chest, genitals and face (upper lip and chin) - you may choose to start shaving;
  • you may get spots;
  • the sweat glands are more active under your arms and between your legs.

Your penis may seem to have a mind of its own! Erections happen when you are sexually excited and often even when you aren't. During an erection the penis grows stiff, longer and wider and sticks outwards and upwards.

You may also have "wet dreams". This is when you lose semen (which is wet and mixed with sperm) from your penis during sleep.

If you have any questions about puberty or you are worried about something, you can get in touch with Ask Brook. Ask Brook is confidential. That means we won't tell anyone you contacted us unless we think you're in really serious danger.

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