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I know Google has the adult filter that takes keywords and blocks adult sites when turned on. This is great, but as with everything doesn't always work.
I think Google can easily search for a meta tag that says the page/site is adult related and flag the site not to show up if the google filter is on.
I feel this could help everyone on the web.
However, adults often aren't as Net-savvy as kids and many probably aren't aware of the adult filter. Some of them will be wondering where all the adult sites have gone!
I think your suggestion would only be detrimental to your industry. Adults will have a harder time finding your site, but it won't stop the kids from finding your site.
I think the basic function of search engine filters is to remove spam results (much of which is adult content). It's far better to rely on porn-blocking software like NetNanny, Cyberfilter, etc.