Lots of teenage boys will be shitting their pants over this, but then again most will easily find a way around it. When I was a teeanger I was the go-to-guy for anything technical, like setting up the VCR or tuning in the TV.
I remember getting my first computer then convincing my mom to sign up for a free month trial of AOL dial-up. One snag: credit card required. Well, being about 14 I had to convince my mom to use her card. We sat down at the computer together and went through the signup process together. I knew there was porn on the Internet. I can only imagine the excuses I would've come up with if we would've been asked "would you like to block adult content?"
Needless to say, when my parents went out a few hours later, I was spraying cum all over the place. Then I spent the next few weeks shitting myself, because I thought that the itemized phone bill might show all the sites I'd been visiting. For the next few weeks I rushed home from school hoping to intercept the bill before my parents got home.
... and I've been whacking it online ever since.