If you have pointed out on your site that those pics will be used...then it shouldnt be much of a problem. Have a disclaimer on your site. If you think a pic is to professional...so it might come from a pro shoot, remove it. I never had problems <a href="http://www.privatexxx.org">
www.privatexxx.org</a> And i have around 15.000 pics online like this. All send in by amateurs.