Big cocks come through nurture. With the internet today, Penis Enlargement techniques have also gotten to the hands of Asian men whereas in the past, Asians had small dicks because that was the last thing they knew how to exercise and only Europeans and Africans had those techniques. The Europeans and Africans were the only ones that knew the secret to having large cocks. Latinos also had smaller penises than Africans. Africans knew how to enlarge their penises through weights. Look at their women who wear huge earrings and stretch their lips and earlobes. That is proof they stretch their penises every day to become large. When Americans took slaves, the secret to a larger cock was lost to some of them as their parents were assimilated into Christianity and could no longer handle their penises. Hence some blacks now have smaller penises than even the Asians in the past before internet. Notice how Asians of the later generation are taller and have larger cocks. Through the internet and access to valuable info, they have learned to grow their penises. However, in every race there are Christians and religious people that don't exercise their dicks and they remain small.
Diet also has a lot to do with bigger dicks. Men need lots of calcium and iron found in milk to grow penises. Soy products shrink dicks and Asians in the mainland do have that problem because they eat soybean milk. Asians in the US and Europe tend to have bigger dicks with the exception of Asians from the mainland that sidestep soy products. I myself learned these things and grew a bigger cock through educating myself. Unfortunately, Japanese guys don't have the time to browse the net and remain the smallest of the Asian guys. No offense to the Japanese but we need more of you to post or appear in porn if you have above 7 inches. I've seen Chinese and Thai guys as long as nine or ten inches on this forum.
I don't have a nine incher by now because internet wasn't readily available in the late eighties and early nineties. The secrets were kept from me until the late nineties when forums such as these and Thunder'sPlace came out and that's when I learned to stretch my cock. Also the extender came out late nineties but was $800 at the time.