First ejaculation
Some time between the ages of about 11 and 16, you may have your first ejaculation. When this happens a clear or white sticky fluid called semen comes out of your penis.

Your first ejaculation can happen when you’re asleep during a wet dream - where you have a spontaneous ejaculation in your sleep. When you wake up, you find a wet patch in the bed. You haven’t peed in the bed, you’ve had your first ejaculation! You might also have your first ejaculation when you’re masturbating. Click to read more about masturbation.

Semen and sperm – what’s the difference?
Semen is the liquid that comes out when you ejaculate. It is a sticky white liquid that contains millions of tiny sperm cells. Each healthy sperm cell is able to fertilise an egg. Sperm can live for three to five days after ejaculation. Some sperm have lived up to eight days after ejaculation.

Image:
1. Sperm
2. Semen

Did you know...?
In the early 20th century the British secret service discovered that semen made good invisible ink.

Each time you ejaculate, 200-500 million sperm are released.

Laughing or crying
During puberty you can feel really happy one moment and gloomy the next. You start thinking more about everything – about yourself and about the world.

Insecure
Because you’re body is changing a lot, you can feel insecure. You may worry about whether you look attractive or whether other people like you. You have to get used to your new body. Don’t worry, that’s all part of it!

Your voice breaks
Around 14, your voice ‘breaks’. This means your voice gets deeper. And it happens because your voice box, or larynx, and your vocal cords get bigger.

During this time, your voice may suddenly come out high and squeaky, and other times low and deep. Luckily this is only temporary. Over time, your voice becomes stable again.

In love
During puberty, you often start fantasising more about a person you really like. This might be a girl or a boy. You also really want this person to like you. You may also feel excited or nervous inside when you see the person. And you might fall in love with them.

Thinking about sex
During puberty, you become curious about everything to do with sex. You think about sex more often. You may feel more excited or aroused in your body. Many boys like reading about sex, looking at pictures and talking about it with friends.