I tweaked the registration page further. The registration options, in order, are:
I do not agree to these terms
I agree to these terms and am UNDER 13 years of age
I agree to these terms and am OVER or EXACTLY 13 years of age
I agree to these terms and am OVER or EXACTLY a malicious computer program
The last one redirects to the harassment site WWW.YZZERDD.COM.
Sadly, the page doesn't start spawning pop-ups until you click on YES or NO, so the page won't dfuck up robots.
I also modded my robots.txt file to disallow search robots from trawling profile.php which is the page that the registration function is loaded through. That'll take awhile to cache, but that should help a little bit too.