Dave, it's easy to say that kind of thing (and the "Pulling Rabbit From Arse" penalty is pretty funny), but pretty much by definition 98% of adult sites are spammy.
I don't doubt that most adult sites, with their reliance of reciprocal linking, inherently heavy keyword loading, and multiple pages any one of which is inherently indistinguisable from so-called doorway pages, are likely to get some kind of knocked-back penalty applied automatically by the algos.
To say the knock-back is 30 positions or 950 positions is probably bullshit - to think that there's a knockback probably has some truth to it.
But, ultimately, we are still left with the problem that adult sites are inherently spammy - they exist to acheive a commercial goal, not to provide commercial free information, which is what google prefers and rewards.
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