my iPhone has "Limit Adult Websites" as an option - and it blocks some known less-than-mainstream adult content sites. I can basically guarantee it consumes the

my iPhone has "Limit Adult Websites" as an option - and it blocks some known less-than-mainstream adult content sites. I can basically guarantee it consumes the RTA header/label in addition to maybe a list of sites Apple maintains as adult content (maybe similar data to those DNS providers with an IP that DNS blocks adult sites).