You could Always tell your kids they are not allowed to and check the histroy,cookies to see if they have many, porno websites load cookies onto your computer,Just make sure your cookes are enable,Also if they are a bit cleaver you can download a program that allows you to undelte cookies,histroy to see,If you are REALLY NEEDING IT install spy software onto the computer they use,and then it basically takes photo's of the thing happing on the computer, and then youcan view the thing they view (COOL!)