ErosBlog has been a 5 for more than half a decade. In that time I’ve added thousands and thousands of links, many of them decent quality if not quite the Wall Street Journal. I’ve got a *much* weightier set of inbound links than many many non-adult sites with higher pagerank. And Tiny Nibbles, which has a whole lot more and better inbound links than me, is stuck at the same PR5.

So, I simply don’t believe that there isn’t some sort of “bad neighborhood” or other penalty being applied to sites with adult content.