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.

Related Articles

  • Alcohol and sex

    There's a strong link between sex and alcohol in our culture but you should be aware of the risk you're taking if you drink too much.

  • Body image

    Be happy with your body - everyone is different, and that's a good thing, isn't it? If you are worried about the way you look, find out more here that will help.

  • Masturbation

    Masturbating is a way of getting sexual pleasure by touching your genital area usually with your hand. It's normal to masturbate and you can find out more here.

  • Keeping clean

    As your body changes as you go through puberty, you may notice that you have to do things differently to keep clean. Find out more here.

  • Penises and testicles

    Everone is different and, like other parts of your body, penises and testicles come in all shapes and sizes. Check out the pictures and information here for all you need to know about the penis and testicles.

  • Boys and young men

    Boys and young men Getting to know your body is one of the best ways to improve and protect your

  • A-Z of sex

    Have you heard a word or phrase lateley that's got you confused? Look at our A-Z of sex and see if you can find out a bit more.


My Contraception Tool

Check out the new My Contraception Tool

A-Z of sex

Find out who won the UK Sexual Health Awards!

Brook & FPA's campaign

Education For Choice

Say YES to 21st century SRE

Your view

This is a quick comments box we cannot reply.