I figure I might as well comment on this since my above post was ignored. As long as they're aware of the workarounds (my above post), this will work for http/https derived pornographic content that has already been listed in the content filters. OpenWrt is needed in combo however, otherwise it's completely worthless, not just slightly so.
Can't we all agree that the effort is futile, but in the case of trying OpenDNS is quick and painless solution. I've done the OpenWRT, DD-WRT, and even a Sveasoft subscriber from back in the day. It can have its own headaches.