interesting

Guys will start to get erections (when the ***** fills with blood and becomes hard). Erections happen when guys fantasize and think about sexual things or sometimes for no reason at all. They may experience something called nocturnal emissions (or wet dreams), when the ***** becomes erect while a guy is sleeping and he ejaculates. When a guy ejaculates, semen comes out of the ***** — semen is a fluid that contains sperm. That's why they're called wet dreams — they happen when you're sleeping and your underwear or the bed might be a little wet when you wake up. Wet dreams become less frequent as guys progress through puberty, and they eventually stop. Guys will also notice that their voices may "crack" and eventually get deeper.