It's a tough call, but after some deliberation I actually went with BlurtIt. It's the same type of stupid as the other Yahoo Answers types of sites, but it does seem to be stupider. We're talking about a community that despite a significant subsection of them being fairly heavily focused on sex, their understanding of it fails on such a basic level that they can't even spell 'penis'.
But what pushes it over the edge is that, of every resource on the internet they can use to answer their question, they have decided on one so bad that I don't know how they got to it. Even putting aside the fact that a Google search or Wikipedia can answer most of their questions, at least the other 'idiots asking questions' communities are better than BlurtIt. eHelp has Rob and IsItLegal has Judge, who at least seem to have an air of knowledge and authority; they seem to know what they're talking about, and the same can go for Verzandeh's dream monster cockysis. On the other side of things, Yahoo Answers is at least prevalent, while Experience Project and IsItNormal have clear mission statements; I can see how you'd reach those sites. I cannot think of a reasoned, intelligent thought process that ends with 'I'm going to post on BlurtIt'.
EDIT: Come to think of it, I don't even know what thought process leads to someone thinking 'I'm going to make BlurtIt', since it really doesn't have a reason to exist, either. Every inch of that website is, near as I can tell, a result of somebody's stupidity.