As you reach puberty your dick begins to grow, and you start to have erections or boners. A boner is when blood pumps into the penis tissue making it hard. This is the body saying you’re ready to have sexual intercourse because trying to put a soft penis into a vagina just doesn’t work.
Your first boner can be a strange but exhilarating experience. The penis enlarges and the foreskin pulls back exposing the head of your cock. There can be a weird tingling sensation when it first occurs but get used to it.
Boners can strike at any time spontaneously and can last over an hour. Quite often they strike at the most unfortunate times such as during class or just before you are supposed to give a speech.
If you find yourself in a tricky situation you can hide your boner by pointing it directly upwards and placing the waist band of your jeans/shorts over the top of your dick to hold it in place. Obviously, you need to let your shirt or sweater hang over the top of your exposed dick. Suck your gut in and the boner won’t be as noticeable.
This is a tricky move, and the better option is to ask to go to the bathroom, wait until it deflates and come back to class.
Sexual arousal also causes boners. You might crack a boner while looking at an attractive girl or even watching a hottie on TV.