What sites actually do this?
"Online pornography hunters' Internet adventures are already fraught with danger from malicious code many porn sites use to commandeer visitors' machines or steal personal data.
Now comes a scheme some researchers say amounts to extortion: One site's threat to disable visitors' computers with relentless pop-up ads if they don't pay for a subscription they were automatically signed up for after a free trial."
http://ap.google.com/article/ALeqM5j...nbq5gD8T6V9RG0