the problem is moreso with affiliates. Paysites can setup some sort of system, but affiliates have sites and post content that are not protected. Look at all the direct adult adwords running on google...Essentially every affiliate must link off to a age-protected front and nowhere else. Then you have the foreign companies that will have power to circumvent this and have a competitive advantage. Consider also that sites have many deep links, meaning even if the front-page follows the law, you'd have to install server-side software to control every single page on your site that a search engine may crawl - it's really a can of worms
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