Re: More than 1/3rd of the website is pron ??
I think the <1/3rd content exemption also requires that the site is not promoting itself as a pron site. So it will be back to the early days of the web, and before that the archives with email based interfaces, where you could unexpectedly stumble across a hiden pron vault while looking for something quite different (e.g. back in the early days of the web when NCSA maintained a "new websites of the month" page that a Dutch university - Delft I think - announced that they were online with there research papers etc, a moderately large collection of F1 video clips ... and the "largest online collection of pron in Europe")