Can we look at this as simply another study in geographic variation of the human species? Probably not, for males who see this map will undoubtedly find their hands reaching for a ruler.
It’s a world map of penis sizes (erect). Note that the tumescent lengths are in centimeters; divide by 2.54 to get inches. If you go to the link and click on the map there, you’ll also see an extensive list of country-by country-values measured in both inches and centimeters, as well as some sources of the data, which were apparently collected and collated from various other sources by Dr. Eduardo Gomez de Diego. Gomez de Diego has made something of a career out of measuring schlongs.
I’m not going to put my reputation behind these data, but present them for your salacious delectation.
Dare I say “click to enlarge”?
Some thoughts, assuming that the data are accurate:
- If you want to pursue this further, Wikipedia (naturally) has a big article on penis size, full of intriguing tidbits like this: “Results vary, with studies that rely on self-measurement reporting a significantly higher average than those with staff measuring, but a mean erect human penis is approximately 12.9–15.0 cm (5.1–5.9 in) in length. Flaccid penis length is a poor estimate of erect length.” And this: “several scientific studies have been performed on the erect length of the adult penis. Studies which have relied on self-measurement, including those from Internet surveys, consistently reported a higher average length than those which used medical or scientific methods to obtain measurements”
- The data from the chart show that the least endowed males are those from Thailand (10.16 cm or 4 inches) and India (10.24 cm, also 4 inches), while the length champions hail from the Congo at 17.93 cm (7.1 inches).
- These data are not normalized for body size. If there is a correlation within populations between body size (measured as length of other parts, like legs) and erect penis size—and Wikipedia is ambiguous on this—then perhaps penis-length values should be relative (i.e. erect penis length/leg length) rather than absolute ones. It’s possible, for example, that some of the large schlong values from the Congo are due to its inhabitants simply being bigger than Indians.
- If these data reflect genetic differences (and that could be verified by measuring the offspring of people who have moved to other locations), and don’t normalize to equal sizes (which I suspect they won’t), then one can speculate about their evolutionary origins. I could make up stories about mate competition or sexual selection, but I’ll spare you. Evolutionary psychologists are much better at this than I. Larry Moran, however, might say that the population differences simply reflect genetic drift.
- The biggest penises are found in populations between the Tropic of Cancer and Tropic of Capricorn. According to Allen’s Rule, which specifies that protruding body parts tend to be larger in populations inhabiting warmer climes (they serve as useful heat radiators, like the huge ears of desert rabbits), perhaps penises helped cool our ancestors. Note: I’m kidding—although there is an Allen’s Rule for animal body parts like ears, limbs, and tails.
It has not escaped my notice that Dr. Gomez de Diego is also CEO of a company called Andromedical, which, according to his blurb, has developed a device to stretch the penis:
Dr. Gomez de Diego, developer of the Andro-Penis®, the top sold penile extender in the world, explained, “with a penile extender the size of the penis can increase 1.2 to 2.0 inches (3-5 cm), with a 97.5 percent rate of efficiency. All this is achieved without an expensive operation, without pain and it is permanent.”
I don’t think so! And others are equally dubious.