Parental Controls programs are definately the best solution to this problem. The are in fact many different solutions you could use.
One very effective and reliable program that will accomplish this is Sentry Parental Controls. It allows you to choose the category, URL, or keyword to block sites with. This allows you to adjust the program to block the most of what you do not want seen.
For more information here’s the site: http://www.sentryparentalcontrols.com
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