Boys

• Boys' shoulders and chests become broader and their muscles get bigger
• The penis and testicles will get bigger
• They have more erections, sometimes for no reason
• They may have a temporary swelling of the breasts as hormones sort themselves out
• Hair starts to grow on the face and sometimes the chest
• Their voices get deeper. Their voice may go up and down or sometimes sound quite croaky all in one sentence
• Sperm will start to be produced in testicles at the time they start to grow pubic hair
• Boys usually start producing sperm between 11 and 16 years
• They can now ejaculate and/or reach orgasm when masturbating. Some boys will have wet dreams