I have an x-rated blog and would like to add a page that says, "This site contains adult material. If your community does not allow such content or you are not 18 years of age or older, please click the Exit button below. If you're 18 or older and your community allows such content, please click the Enter button."
If they hit Exit, they go to Google, and if they hit Enter, they go to my blog.
This is a WordPress blog.