networkn:
Yes. You will never be able to stop a determined kid from finding a way to access content. You can make it hard, some kids will give up, but you are better to deal with this as a parenting problem not a technology problem and explain why it's important they don't access that content. Start with the 'why'
Indeed. I recall some boys on the bus passing around pages ripped from a dodgy magazine... no technological solution would stop that.