There's a Map for That: Penis Size Around the World
Our friends at Shanghaiist have shared the Penis Size Map, which, well, pretty much does what you think: "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." Americans? Well, we're firmly in lower quadrant, with an average length of 5.1 inches.
Those numbers actually jive with some rankings and a map released around this time last year by Condomania, which shows in which U.S. cities you'll find the biggest dicks. Their data, which was self-reported based on sized condom purchases, indicates that 50% of American penises are between 5" and 6" long.
A second map published by the Penis Size Map people attempts to correlate penis size with brain power, by showing IQ rankings. Here, Americans happen to finish in the upper echelon, with a global ranking of 10th for IQ. So basically, the US is full of smart guys with average genitals.