Apparently, the French are the biggest Dicks, and the Koreans the smallest – based on a sample size of around 2000…

The study results showed that the average world size penis when erect is 14 centimetres (5.5 inches). The biggest averages were registered in France 16 cm (6.2 in), Italy 15 cm (5.9 in), Mexico 14.9 cm (5.8 in) and Spain 14 cm (5.5 in). In the United States, the average is 12.9 cm (5 in) while in Venezuela is 12,7 cm (4.9 in), and in Brazil is 12.4 cm (4.8 in). The smallest averages were found in India 10.2 cm (3.9 in) and South Korea 9,6 cm (3.7 in).