This Penis Size Map is from a completely serious new website called TargetMap.com. According to this map, Congo, Ecuador, Ghana, Colombia and Venezuela are the world’s most well endowed nations, while South Korea, Cambodia, Thailand, India and Burma — all in east Asia — are the world’s least well endowed. Chinese men, clocking in at 10.89cm (4.3in), are the world’s #8 least well endowed. Unfortunately though, because of difficulty in collating data, what you see on this map is from statistics compiled at different points in time. The data for China was apparently from the heady days of revolution (and malnutrition) in 1953.
This other map attempts to correlate national IQ scores with average penis size (seen on the map as the size of the black dot). In the case of China and Africa, the two appear to be inversely correlated.
UPDATE: Breast cup sizes: Now there’s a map for that too!