DJ, my opinion is that Google has pretty much set limits for certain segments, especially sites that are identified as porn. There are limits on potential PR, and I suspect they are much more agressive with certain techqnieus to detect junk sites.
This is one of the reason why using expired non-adult domains to pump porn keywords was such as success at some points, because those non-adult flagged sites appeared to have much more power and potential to pass PR and good SERPs around than any porn site. My feeling is that the evilPBS page stays high in the rankings for porn because of some linkbacks from high profile sites not tagged as adult sites.
Google does some seriously sneaky shit.
Alex
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