Interesting thread
How does any surfer arrive at your warning page? For freesites it's through a link from a porn site, or a link from a search engine whereby the surfer has searched for porn. I'd be amazed if anyone is getting traffic from a SE to a freesite using non-adult searches, unless they were specifically aiming to trick people that are searching for knitting patterns into clicking a porn link - not exactly a productive use of one's time.