If it's top converting and fresh hardcore sites you are after (and a few with some neat twists !!!),
LionDollars has you covered in spades, with no angle on that niche left uncovered (pun intended !!!). They have HEAPS of sites, including:
Fuck Christel
Hard Porno Films
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Horny Baywatch
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Penetration Babes
Penetration Circus
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LionDollars have Over 120 sites covering all the niches, they add new sites weekly to avoid saturation and they also have more than 20000 hosted galleries (OVER 300 per site).
LionDollars pay up to $40 per join weekly by EPassporte, check or wire and they have MORE than 10000 promo pictures with NO watermarks !
They are serious in making webmasters promotions work !!!
;-)