1. Answer: It depends on everyone's taste and these rankings change all the time. According to RankMyPorn, at the moment, the top ranked Unknown Ethnicity Male Pornstars in the world are: Chris Diamond, Alex Jones, Voodoo, Matt Denae, Brannon Rhodes, JB Rodeo, Jay Savage, Mikey Butders, but these will change based on what people vote.
2. Answer: It changes. You can see the latest rankings on RankMyPorn.com and also vote on it for free.