Ask your husband to deal with it they are both male it will be easier, stay out of it let him sort it out I doubt if you will stop the behavior it is a normal process , simply ask his father to take over in telling his son that there are bounderies., that he can use his own room for that purpose, also he should not go into your room or touch your underwear.
we have took the computer away but you also got to remember there are two other kids that live in this house and the computer has always been in the living room or dining room so they dont have a chance to go to them sites because we always know what they are doing on it. he did this when i was at work. i have cutting him slack for two years but i have other children who live here that i have to protect to.we have had several talks ith him but he just dont seem to care about nobody but ricky and thats not fair. as far as my undewear go i have been putting my clothes in the hamper in the bathroom all my life thats normal its not normal for him to invade that space
. we have done lots of changing since we got custody of him but you have to remember this is our house to and at 16 he knows right from wrong.
You can set the rules on the use of the computer have you a block on it to stop porn, does anyone else in the house use the PC for porn ?The fact he went straight home to his own room is his business he didnt do it in front of anyone. His Father should have a talk with him about bounderies for this, it should be private, cut him some slack as he is at that age when this is going to happen. As for your underwear make sure it is put away and set the bounderies on your bedroom he doesnt have to go in there does he, his father is the one to deal with this ,take a step back and let him deal with it.You could also focus on his positive side, praise him when you see him doing something right.