I noticed this in today's Grauniad "My father-in-law is masturbating in my house He uses my laptop to view internet pornography and I want it to stop My wife's father, aged 68, moved in with us recently. He's nice, but seems to be addicted to internet porn. I know that he pleasures himself on our sofa using our laptops when we are out or upstairs a lot. How do I stop him?" So how do you intervene to save the old chap from further shame? Do you pull his plug out? Or do you let him carry on and put a throw over the sofa?