Men in Cambodia supposedly have the smallest penis in the world.
This is according to figures compiled on an interactive map by MailOnline.
Cambodian men have an average erection length of less than 10 cm (4 inches), according to the data.
At the other end of the scale, men in Ecuador supposedly have an average size of almost 7 inches (17.6 cm).
The UK and US are nowhere near the top ten in terms of size.
In fact, neither country is among the top 50 in the ranking of 88 countries by the German website WorldData.
As for penis size, he claims to have scoured numerous academic studies and online databases.
Great Britain is ranked 68th with a penis size of 13.1 cm (5.2 in) and the United States is ranked 60 with 13.5 cm (5.4 in).
Australia ranked 43rd with an average size of 5.7 inches (14.46 cm).
The team pulled data on average penis size from nearly 90 countries, and the measurements were independently verified.
Britain ranks 68th with a penis size of 5.2 inches (13.1 cm) and the United States ranks 60th with men with an average size of 5.4 inches (13.5 cm).
Wherever possible, the team avoided using studies in which men self-reported their penis size.
In cases where individuals had a fat pad on top of the penis, it was compressed slightly to assist with measurements.
All of these were averaged for each country and then converted to inches to allow comparison between different nations.
The European countries with the largest penis size overall were the Netherlands at 9th at 6.2 inches, France at 11th at 6.2 inches, and Italy at 19th at 6 inches.
The researchers behind the list said they had difficulty finding a connection between penis length and height, but found that countries with higher obesity rates tended to have smaller members, which could explain the distribution of fatty tissue. .