I caught my brother.

[RayzoR]

Let him be and if your parents catch him, then I'm sure they'll take action. However, I do recommend you not pull him aside and talk to him about it. He's very young and seems like he'd either be embarrassed or ashamed of what he's done and might change his thoughts about "sex" and "girls" if you ask me. Maybe when he's a little older and if he's still doing the same thing, then pull him aside. Let him hit 13 and then talk about it. That's usually when boys hit puberty and hormones are at its climax.