Dutch people were not tall at all since few decades ago. If they are tall it’s not a matter of genetics, but a matter of diet. Japanes are becoming taller because diet too, not because race.
Japan is one of the wealthiest countries in the world. They have a famously healthy diet. Why aren’t the Japanese already as tall as, if not taller than, Europeans?
‘is there any reason why penis size shouldn’t also have some variation with ethnicity?’ - because it wouldn’t serve to anything?
You’re falling into the trap of thinking that any feature of a living creature must be there because it serves some evolutionary purpose. This is not true. Often things are left over as a vestigial version of something that used to be useful (like the appendix in humans) or is useful in the other sex (nipples on men). Some things are the way they are ‘just because’, due to accident or mutation or whatever. I mean, what purpose does it serve for some people to have blue eyes when most people in the world have brown eyes? None whatsoever. It’s a mutation that ‘caught on’, for some reason.
If there was a good scientific reason, that was already been found, believe me.
Yes, because scientists have already found out everything there is to know about everything! ;)
Who cares if people of a given etnicithy have on average a few millimeters more or less than another? Why white men are so obsessed on the size of blacks and asians? In the best of cases, there isn’t any way to know the truth, so? Is arguing basing on each own supposed personal experience which, who knows why, has to be superior to someone’ else personal experience a good path? It seems a good way to raise shit and nothing else to me.
I’m straight, so the only erect penis I have direct experience of is my own. But I’ve seen a fair amount of porn, and yes I know the porn industry obviously exaggerates the racial differences - but why would the stereotype be there in the first place if there wasn’t some basis to it? And of the gay and bi guys here who’ve shagged their way around the world, several are saying there is a noticeable variation.
In truth, it doesn’t really matter, I agree (as long as people have condoms they can rely on, wherever they live!) - it’s just that studies on size tend to be conducted just in one country, so when talking about “average size” you have to bear in mind it just means average size in that country, among presumably healthy men who might agree to take part in a penis-measuring exercise.