My kids weren't interested in watching adult-level stuff --I think because they'd run into it in bits and pieces here and there (usually at other people's houses) and found it disturbing enough to want to avoid.
Since I spent the vast majority of time with my kids until they were in their early teens, I had a very good idea what they were watching --because we talked about pretty much anything that bothered them, or that I wondered what they thought about ... so it never seemed necessary.
From when they were really little, we programmed the tv so that they only channels they could get to with the up and down channel buttons were 'okay' -- no network news, no sports channels, no music video channels, not Fox. We could still get to them by knowing the channels ourselves, but they never happened to go past them.
We kept the computers in the main part of the house where anyone might be standing behind them anytime.
at 11:16 PM on Nov. 26, 2010