There's been more than enough studies on this in the scientific community but one thing I've found on message boards is that people somehow trust anonymous postings more than scientific research. Ah, that wacky human race..... Three of the most respected Researches have found three different answers.
Masters and Johnson found that Caucasians generally have the largest penis with an average of 6.4 inches. The Black male placed second with an average of 6.2 inches. The Hispanic male averaged 6.0 inches and the Asian male placed 3rd with an average of 5.6 inches.
The Kinsey Research found the average black male to have 6.3 inches and the average white male to have 6.2 inches.
A research financed by Trojan Condom Company found that Arab men have a larger size with an average 6.3 inches followed by the black male with 6.2 inches and the white male with 6.0 inches. Condom companies have done researches like these to deal with condom breakage and not to prove size by race so it's not an exhaustive measure.
There's also the Phillipe Rushton study which claims black males have the largest penis and Asian males have the smallest but he also says black males are traditionally stupider while Asian males are traditionally smarter. Kind of a good news bad news thing, huh?
As you can see the difference in sizes are equivalent to about a quarter inch or so or 7mm according to scientific studies. Not very substantial to say the least.
Of course if these findings don't satisfy you then feel free ask to a female porn star or use your porn multimedia as your realistic reference and a definitive answer. But keep in mind that if you do this, then you must also accept the fact that women order pizzas all the time without having money and will have sex with the delivery guy to pay for it. You must also agree that all women love taking it up the ass regularly. Also your mom will have sex with your friend or a bunch of black guys if you owe them money and of course all white men put off Peter North type cumshots and hispanic men put out cumshots like that guy Anselmo from Mike in Brazil.
But seriously the vocation of male porn star is not a scientific nor reliable conduit for research on penis size or ejaculation due to the different variations for one becoming a porn star designed to set him apart from the average male. He can get it up and fuck a girl in front of a camera crew, cum on demand and has a very strong sexual stamina. The average male would make a so-so porn star so who wants that?
I'm predominantly black followed by hispanic and a little Caucasian thrown in and according to my GF, my dick is the perfect size but the plaid color throws her off.