Firstly the fact you are paranoid enough to spy on your son is a real concern. Secondly all he appears to be doing is engaging in harmless experimentation which is perfectly normal for any child. When he reaches his early teens this experimentation will naturally progress to exposing himself to girls (or boys if he is that way inclined) and enjoying the sensation of somebody else touching his erect penis. In all likelihood this will progress to having others masturbate him. Obviously he will have begun masturbating on his own by this stage (usually boys start between 11 and 13). All of this is perfectly normal healthy and natural exploration and experimentation - which all of us engaged in at this age. No doubt in his teens you will suffer the embarrassment of accidentally walking in on him masturbating (usually when you have arrived home unexpectedly or too quietly for him to realize). And as with the questions you are asking now, the manner in which you react to that situation will be the substantial indicator to him of how to regard his behavior. Masturbation is perfectly normal and healthy. If you react in a way that signals to him what he is doing is wrong, abnormal or naughty, this is what he will pick up on and is the single most harmful signal you could possibly send to him - that his sexual behavior is bad, wrong or naughty. This would cause him considerable confusion and at worst could have him feel sex or anything sex related is shameful and should be hidden - ie he should sneak about in the bushes to conceal sexual activity. On the other hand although embarrassed and uncomfortable at walking in on him masturbating, you could apologize for the interruption and leave him with the impression nothing is wrong - which it isn't. Then at the next opportunity you could just tell him quietly when you and him are alone what he was doing is perfectly ok and normal and it's ok for him to be doing what he was doing. Although he will feel awkward about you saying this he will take on board what you have said. You might even consider installing what I like to call the "masturbation lock" on his bedroom door for him so he has privacy. A simple bolt lock that he can slide shut from inside his room will suffice. Or alternately when he reaches an age where he has likely started masturbating, you could adopt the practice when ever he is in his room with the door closed, to always knock before entering and waiting for him to give you permission to enter before doing so.