Obviously, adult site owners don't have many of the same options that mainstream site owners do, when it comes to reversing the effects of penguin. If you assume (as I do) that this is mainly a backlinking penalty - how are you dealing with the problem? In my case, a ton of xrumer/SB/dripable links can't just be taken down and the amount of time it would take to dilute existing links with good-quality backlinks is enormous. (I have a ton of previously top-10 adult sites that now have been hit with +500 penalties.) How are you addressing the Penguin if you have hard-hit adult sites?