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Google ads may not be placed on adult or mature content. This includes any site which contains:
pronographic images, videos, or games
pronographic cartoons or anime (hentai/ecchi)
For more information about keeping your content family-safe, please review our program guidelines and these tips from the policy team.
The AdSense network is considered family-safe, which means that publishers aren't permitted to place Google ads on sites which contain #*$!ography, adult, or mature content. If your site has content which you wouldn't be comfortable viewing at work or with family members around, then it probably isn't an appropriate site for Google ads.
Had you removed the offending page in the first place, your violation would have been resolved because the robot is not as strict.