you can consider installing a porn filter on his computer, strongly recommend NetDog, I 've installed netdog on my computer for two months, it works greate to block all porn websites
here's its key feture:
Embed "Filtering Engine" into Windows Operation System !!
High Performance Content Filtering Algorithm ! Quick Filter ! !
Support user-defined Url block!! ( black & great url lists ), Support wildcards (* and ?) and keywords in url !
Password protected with NetDogAdmin !
Simple user interface!
Effective & efficient Filtering algorithm to block all porn sites: NetDog Porn Filter uses unique " contents filtering algorithm " to block pornographic websites. It also supports url filtering technology . With this advanced algorithm and technology, you can completely rely on NetDog Porn Filter to keep your family safe from pornography.
The Most Easy-to-Use Porn Filter: You don’t have to do anything after you install NetDog Porn Filter. NetDog Porn Filter uses special technology to embed itself into windows operation system, so you won't find any NetDog process running on your computer.But NetDog will block all pornographic material automatically . NetDog Porn Filter not only works with different browsers like Internet Explorer,Firefox but also it works with other Internet program (e.g. MSN) . After installing NetDog Porn Filter, you just visit "playboy.com" and other porn sites to test.If you are not able to visit them, that shows your NetDog Porn Filter is working now. If you want to change filtering settings, you can always use NetDogAdmin to do it.