hmm, there's this new one called "Common sense"
check the 11 year olds history, and warn him about such things. the sites that come up "automatically" are due to spyware programs, and you need an antivirus program to fix that.
PS. any site that pops up porn on auto, is probably not good for an 11 year old in the first place, advertisements are based off the website you go on, and the kind of people that use that site.
if there's porn it's either
1. an adult related site in the first p lace
2. it's not monitored very well, and there's probably other harmful things on it.