Let's assume that I have a blog with content not suitable for minors. I would like each new visitor to get a pop up message which would require him/her to acknowledge that they are aware there is mature content behind the message and that they certify that they are of legal age and not offended, blah blah. Unless they'd click on "Let Me In" button, they would not be allowed to preview the site. This way the site with mature content would have a gateway blocking potential minors from accessing as access would not be granted unless you click on the button, and by doing so you certify that you are an adult (it's at least some form of legal protection as if they are a minor and click never the less, they intentionally lie about their age, hence it's their fault not yours).
Is there such plug in that would do that? I would like to use one.