Parents no longer have control over what their kids see
No longer , um, they never had if my 'long' memory serves me right. Kids are much the same as they always have been, the technology may be different - thats all.
Now you are going to make the point about watching by mistake... no worse than picking up certain books in a library or magazines at a newsagents( or more likely at school ), by 'mistake'.
Where do you draw the line on 'p*rn' ? who knows it's what makes an individual feel uncomfortable , either themselves or for people they are responsible for, thats my definition.
I get really fed up with pressure groups trying to run peoples lifes ( and their children's ), seems a common theme these days. No riding your bike to school now kids, way too dangerous, no climbing trees, no walkng on your own, no ... fill in the gap yourselves.