Imho, porn except being source of sexual arousal for people who masturbate on daily basis around the world, has one distinctive characteristics: it holds out against political correctness. Porn appears to be the last field of human activity where traditional sex and race models are being kept and, surprisingly, nobody objects. Why it happens? Most likely because we perceive porn as the underlying truth about world and ourselves. During daylight, in social situations we play our wordgames full of sweet little lies, but at evening when nobody watches, we plunge into the world of white men who treat women how they should be treated (cumshots), where females are attractive and always willing to **** like they should and where groups of black males appear to be nothing more than a bunch of agressive chimpanzees. So, during masturbation, not only sexual tension is eased, but also social one - the world returns to its primal normality where white men rule.