I have had good luck with CL sometimes your have to sift through a bunch of duds to find that diamond in the rough but that applies to other hookup sites and apps too.
Latest evidence says that your safer fucking an undetectable guy than someone who claims to be neg http://www.queerty.com/study-undetectable-guys-do-not-transmit-hiv-to-negative-sex-partners-20140305/
You can apply on most of thier websites. But I would tweet some porn starts and ask them for advise on Twitter as many are on thier and seem like they would be willing to give you some advise.
You will have better luck going to San Francisco, LA, OR NYC where BB studios like Treasure Island are based and film thier videos, if you are serious about this.