I know this is an old post, but I was surprised that it had zero comments, so thought I'd offer a few thoughts:
I'm not sure I'm convinced by your argument that "race is correlated to height, and height is correlated to penis size, therefore race should be correlated to penis size," for a few reasons.
1. Your citation for race-height doesn't actually say anything about race -- it just lists average heights by country. That's a problem for a lot of reasons, but I'll cut to the chase: what we really know is that height varies somewhat based on ethnicity, but we also know that ethnicity is not the same thing as race, and it seems self-evident (and is supported by science) that *many* (though not all) of the factors accounting for height differences across countries/ethnic groups are not genetic.
2. The evidence for the correlation between height and penis size, per the source you cited, is also not rock-solid, IMO. That study acknowledges some of the same limitations that you mentioned in methodology/confidence, first of all. But even beyond that, the correlation coefficient they found "ranged from r=0.2 and 0.6." That's a pretty big range! The low end of that range (0.2) indicates very weak-to-no correlation -- essentially, statistical noise that wouldn't be helpful at all in predicting one attribute based on the other. At the high end, it's a moderate correlation, still not an extremely strong one. And we still have to acknowledge the aforementioned limitations of the data.
3. Okay, for argument's sake, let's assume the correlation is at the high end of that range. Per your wikipedia source, the range of highest average male height to lowest, by country, is 185.6cm to 158.7, a range of 26.9cm. 90% of countries fall in the range of 180.7 to 163, a range of 17.7cm. So the range of average male heights by country, globally, shows a variation of about +/- 7.5% from the average, with 90% falling within about 5.2% deviation from the average. Now, when we're talking about human height, that makes for some fairly easily perceptible differences. But let's say we assumed a *perfect* correlation between height and penis length, and applied those same percentage ranges to that. Let's go with the "worldwide average stretched flaccid penile length" of 5.21 inches cited multiple times above. And let's use the larger range, from the tallest country to the shortest. With a perfect correlation, we'd expect the range of penis sizes, from the "longest" country to the "shortest" to be... 5.6 inches to 4.8 inches. We'd expect 90% of countries' averages to fall between 5.48 and 4.93 inches. All that's to say, I think we'd "notice" the difference in penis sizes a lot less than we do the difference in heights (and, again, that's if the correlation was "perfect," an r=1.0, which it is clearly not, and likely far from). And, again, that's not accounting for the fact that a lot of the difference in height across countries are due to non-genetic factors, and I'm not sure we'd find nearly so much variation in height if we were able to reliably measure for "race" rather than just the countries that folks were born in.
All that said... I tend to agree that it's somewhat unlikely there's *zero* correlation between race and penis size. But I'd be very willing to believe that, if it was even possible to figure this out in a scientifically rigorous way, the difference would be small enough as to be totally unworthy of discussion.
I know this is an old post, but I was surprised that it had zero comments, so thought I'd offer a few thoughts:
I'm not sure I'm convinced by your argument that "race is correlated to height, and height is correlated to penis size, therefore race should be correlated to penis size," for a few reasons.
1. Your citation for race-height doesn't actually say anything about race -- it just lists average heights by country. That's a problem for a lot of reasons, but I'll cut to the chase: what we really know is that height varies somewhat based on ethnicity, but we also know that ethnicity is not the same thing as race, and it seems self-evident (and is supported by science) that *many* (though not all) of the factors accounting for height differences across countries/ethnic groups are not genetic.
2. The evidence for the correlation between height and penis size, per the source you cited, is also not rock-solid, IMO. That study acknowledges some of the same limitations that you mentioned in methodology/confidence, first of all. But even beyond that, the correlation coefficient they found "ranged from r=0.2 and 0.6." That's a pretty big range! The low end of that range (0.2) indicates very weak-to-no correlation -- essentially, statistical noise that wouldn't be helpful at all in predicting one attribute based on the other. At the high end, it's a moderate correlation, still not an extremely strong one. And we still have to acknowledge the aforementioned limitations of the data.
3. Okay, for argument's sake, let's assume the correlation is at the high end of that range. Per your wikipedia source, the range of highest average male height to lowest, by country, is 185.6cm to 158.7, a range of 26.9cm. 90% of countries fall in the range of 180.7 to 163, a range of 17.7cm. So the range of average male heights by country, globally, shows a variation of about +/- 7.5% from the average, with 90% falling within about 5.2% deviation from the average. Now, when we're talking about human height, that makes for some fairly easily perceptible differences. But let's say we assumed a *perfect* correlation between height and penis length, and applied those same percentage ranges to that. Let's go with the "worldwide average stretched flaccid penile length" of 5.21 inches cited multiple times above. And let's use the larger range, from the tallest country to the shortest. With a perfect correlation, we'd expect the range of penis sizes, from the "longest" country to the "shortest" to be... 5.6 inches to 4.8 inches. We'd expect 90% of countries' averages to fall between 5.48 and 4.93 inches. All that's to say, I think we'd "notice" the difference in penis sizes a lot less than we do the difference in heights (and, again, that's if the correlation was "perfect," an r=1.0, which it is clearly not, and likely far from). And, again, that's not accounting for the fact that a lot of the difference in height across countries are due to non-genetic factors, and I'm not sure we'd find nearly so much variation in height if we were able to reliably measure for "race" rather than just the countries that folks were born in.
All that said... I tend to agree that it's somewhat unlikely there's *zero* correlation between race and penis size. But I'd be very willing to believe that, if it was even possible to figure this out in a scientifically rigorous way, the difference would be small enough as to be totally unworthy of discussion.