I have been married for 2 years and in that 2 years I have caught my step son m*********** multiple times. I saw him doing it with p*** on his laptop and sometimes when I walk past his room he is doing it. I said something to his father about it when we first got married but he says it is normal. But sometimes it is as if he wants me to catch him. Is this normal for a 19 year old boy to act? He has a beautiful girlfriend, why does he have do this when I am around?