I agree with the other posters but this is an unhealthy fixation for that age that would not be normal to think about to begin with. I'd be concerned something happenned to him that caused him to become obsessed with this material. It would best for him to speak to a child psychologist and see if something has happenned to him or if he has some problems that caused him to access this material to begin with. Children should by no means be allowed unrestricted access to the internet but if allowed they would not be interested in this material. This is clearly something wrong and I'd be concerned as to what.
He's at an impressionable age. Does she really want him to think this is an ok thing to do with women? That this is how he should in fact treat women? No 12 year old should be watching S & M or porn, period. For that matter, I don't think adults even should be looking at that trash. Garbage in - Garbage out!
Very concerned , she is enabling behavior, block on the PC.....in fact supervision when he is on the PC totally inappropiate ....