It's been proven a billion times that penis size does not vary by race, other things influence penis size such as height, weight, health, diet, lifestyle, environment, climate and so on either as a combination of those things or one of things and nothing to do with race.
If penis size varies by race then so does the size of women's breasts and vagina depth/size oh wait women's breasts size and vagina size/depth doesn't vary by race (I should know since I fucked women of every race) so what the fuck should penis size? It's pretty obvious that women of all races who are celebrities, models, pornstars and women you see everyday they all have different breast sizes and since I've had sex with women of different races I can tell you that vagina depth/size doesn't vary either.
The reasons why that racist and pathetic black cocks are bigger myth is still alive is because of porn (porn is about fantasy at the end of the day) and other is racism or in this case black supremacists as seen on not just professional porn sites but also amateur sites and adult social networking sites and sometimes even adult dating sites.
Ever since it has been proven (as shown in TV programmes) that penis enlargement is possible as long as it's done correctly and safely my guess is the majority of men out there who have a big penis regardless of race most likely had them enlarged but rather then being honest about it they used the classic line "I was born lucky" which is actually quite understandable so if I was in that situation I would say that line too while others who would keep the penis size myth alive would also lie about it and keep the myth alive on purpose. Of course bare in mind only a minority of people in every race are racists, are racial supremacists and so on so the best way is to make sure that it is the minority that is like that while the majority are not racist, are not racial supremacists. Education is the best way to defeat these things at the end of the day.