For their new study, the Singen-based Institute of Condom Consultancy asked 10,500 men in 25 countries to measure their penis and enter the number into a database. But my favorite part of the Reuters article on Yahoo! News is where it says:

"The results show Frenchmen on average claim to need 15.48-cm (6.09-inch) long condoms, about 3 cm longer than Greeks, whose condom-size requirement was the most modest. He did not want to comment on how honest he thought the Frenchmen had been in reporting the data."