In the US they practically HIDE the rating on the box! God knows what it must be like for a parent who actually cares about what their children watch! Although from experience, unless it's sex related, they're usually not bothered!

I remember catching Lethal Weapon on a normal advert-laden channel at around 3PM in the afternoon: All the nudity (what little there is) was gone, but amazingly ALL the violence (even the horrible torture scene at the end) was included uncut!

Another time I was talking with a mother who used to sit and watch CSI with her 8 year old daughter?!