i dont know about this. my university has a good amount of asian people and i've had a few in the same dorm hall for the last 3 or 4 semesters. and when showering, most seemed to be pretty average in size about the same as the other guys who were a mixture of races (white, black, hispanic, etc).
also, my current roommate (who is south korean) and i were a little drunk one night, and started talking about each others cocks. he commented on how big mine was from what he'd seen in my briefs when walking around our suite and etc. but after i began jokingly doubting his claims of having a big cock, he stood up and pulled it out. it wasn't huge, but still, he put me in my place. (it hung probably around 6 semi-hard)(he told me his dad, and brother also had pretty big dicks, but his cousins were either average or small)
BUT, i wont lie though, there were a few asians that i was shocked were even real, cause they were so small, (like maybe around 2-4'' flaccid) but only a few. at the same time though, i've seen a few hispanic and black guys who were extremely tiny too.
i, like most people, was ignorant, and believed all the stereotypes of asians having small cocks and black guys having big cocks, etc.
but the thing is, i've been bigger than most all black guys in my dorm hall, excluding a few.
i just think that there cant be 100% truth to all the stereotypes.
and this map is just a representation of what people assume about races and countries around the world.. ridiculous.