The men of Africa's Republic of Congo are best equipped at 18cm. In Europe, Icelanders are the best endowed at 16.5cm.
The research has been conducted by Richard Lynn, professor of psychology at Ulster University, who says the findings back up previous theories of "race differences in penis length".
However, critics say the controversial professor's research, published in scientific journal Personality and Individual Differences, is flawed because he gathers his data from websites and that is unreliable.
Lynn's previous research has claimed men have higher IQs than women. But his latest findings make it seem certain that this is the research he will be remembered for. And we won't be letting the Aussies forget it.