Measuring penises is a tricky endeavor, at least that's what scientists have reported back over the years. Does a researcher pull out the tape measure himself or allow the participant to self-report? Should the penis be examined while flaccid or erect? And what about the matter of gauging girth?
As explained in Slate, the primary penile measuring method used today is stretching. Stretching a flaccid penis as far as it will give provides the most consistent model, and usually the ruler reaches from the pelvic bone to the tip of the glans.
Using that stretching strategy, Korean urologists recently found a correlation between penile and digit length. Specifically, the ratio between the length of a man's index finger and ring finger may relate to the length of his penis. The shorter the index finger, compared to the ring finger, the longer the penis -- possibly. Before men start fretting over their fingers, they should remember that the study included only 144 men, a far cry from a sufficient sample population. There is, nevertheless, a potential explanation for the finger-penis hypothesis, via LA Times: "A variety of studies suggest that the ratio of the two finger lengths is determined by prenatal exposure to sex hormones, both testosterone and estrogen. It is not unreasonable to assume that penis length might also be."
While the influence of prenatal hormones on our anatomy may be useful for doctors and scientists, it might only fuel small penis syndrome. According to a 2007 study, around 45 percent of men are dissatisfied with their equipment and want a larger penis. However, most of these men also fall squarely in the average penile range, around 5.5 to 6.2 inches long. As Molly and I emphasized on our Stuff Mom Never Told You chat about the size of the boat, penis length-related anxiety is often much ado about nothing, at least to the 85 percent of heterosexual women who are perfectly pleased with their partners' package.