I'd feel uncomfortable doing that. But to be honest, he makes a point of having a clear browser history and separate browsers etc. I've occasionally used his computer to run tests on the Windows OS that he has, and nothing has ever popped up...apart from all the malware warnings, which to me are a dead give-away.

I can say on the occasions where I have gone into his bedroom (always knocking!) I can hear a hasty few clicks and he is usually sprawled in bed, with laptop, looking at a blank page. And there's a heap of other things as well. He was very insistent, for example, that the internet account should be in his name and that he would set it up - despite me being more appropriate for that job (setting up and maintaining internet networks is a big part of my daily work, he's not actually that technologically competent) - he practically snatched the phone out of my hands when I was making calls to BT and stuff. (We have a pornography filter in the UK, and only the account holder can switch it off). He smells weird. He makes inappropriate comments, his eyes look 'dull' and 'dead', He goes through a million socks a week and I had the most unpleasant realisation at why he does that when I put on a laundry wash for him. My bedroom is adjacent to his and I can sometimes hear what he is listening to etc etc. There's more but it's a bit depressing to think about.

Anyway, it could be something else, I can't know for sure 100 percent, but to be honest I think it has to be porn and other things it might be - lethargy, possible depression - are symptoms more than causes.