My mom has a boyfriend who lives with us now for about two years. His son Eddie is here two weekends a month and I am convinced he is an exhibitionist. I see him him naked at least three or four times every weekend he is here and don't know how many times I have seen him masturbating when My mom and his father are out. He tries to act like he doesn't know I am watching him but I sure he does this on purpose. I have told him many times that I see him naked around the house but al he says is sorry which I know he doesn't mean. He's only tried three times to peek in at me in my bedroom and the third time I smaked his face so now he doesn't do it anymore. He's naked alot even when My mom or his dad are here but is always sneaky about it. Its funny to me anymore and I just laugh about it and tell him its not big enough for him to show his penis off to anyone. That doesn't stop him though and not always but he often has an erection while coming out of the bathroom naked. He's only 13 so I just laugh about it and wonder if he does it to other girls around him. He tells me I'm pretty all the time so I just tell him to grow up.