Common, considering that your old enough to have a child that is withing the range of 14-16 then you should also remember looking at porno mags, burning bugs with a magnifying glass and setting things on fire.

The more you try to control the more they want to say screw you and do it anyways.

just let your kids be free to explore the net and make there own decisions but I would reccomened the following rule list:

No virii: Make them promise on pain of jail-time not to write em

No hacking anything beyond a friends or relatives computer

No following the crap in the digital format versions of the Anarchist cookbook or similar writings without the supervision of Mom or Dad

In general just put rules in place that will provent your child from going to jail or dying. Everything else should be cool.