Part of the problem is the material that is available on the internet. This isnt little Johnny finding his dads Playboy magazines or finding the parental code for the TV and watching the Hustler channel.
Click on this link to find a list of movies banned in Canada but which you could likely find clips of on the internet with relative ease.
http://www.thesmokinggun.com/archive...71canada1.html
Take a walk thru an adult video store and youll find entire genres based on concepts that most people couldnt even imagine existed.