Damn, that's quite a few domains that a-hole owns! You might want to try and move your submit page. Another idea is you also might want to go to a trusted submitors list and let go of the public submits altogether.
I ended up doing that for my TGP. It's only a small one that gets so-so traffic, but it cut down on all the shit that was coming through everyday.
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<a href="http://www.directoryforadults.com">Directory For Adults</a> - <a href="http://www.directoryforadults.com/cgi-bin/dfa/addlink.cgi?action=metaform&category=">Submission Page</a>
<a href="http://www.worldwebporn.com">WorldWeb Porn - <a href="http://www.worldwebporn.com/submitsite.htm">Submission Page</a>