how large is the sample size
Finally, how large is the sample size? If it’s only 20 men, a single large or small dick can skew the results.
A definitive study would involve a large and completely random selection of men from a wide variety of human populations (or a similarly large and completely random selection within a specific population depending on whom you’re measuring yourself against). It could be conducted free of bias using exactly the same methodology for each subject. And it would be conducted on penises at peak erection. This is a pretty tall order and not surprisingly, out of the dozens of studies conducted, not a single one has conformed to all of these requirements.
Perhaps the single greatest difficulty in measuring the erect dick is the variation in the erection size of a single individual. We all know when we’re busting a maximum stiffy, but we can’t always conjure one up at a moment’s notice, especially in a clinical setting. To counter this problem, one study measured every guy coming out of a nightclub on spring break. They used attractive women to act as “fluffers” to help them build up a head of steam. And it seemed to work. The experiment is seen as one of the most definitive and the average came in at 5.9 inches.