> what can I do to keep them away from stuff 99% of people agree isn't for children to see, without something like this?
> before they're ready to handle it
You can restrict any access for the network to them. Extra bonus, this will save your child from addiction.
...unless they go and visit Mikey over the fence, whose parents are cool unlike you and let him – willingly or not – wank to hardcore porn at 11.