Using data from 17 studies that covered (or uncovered, if you will) over 15,000 men, science finally has a definitive answer on what the size of the average penis is. 

According to new research published in the British Journal of Urology, there is an average size when it comes to the male genitalia. Using data taken from a number of studies that had looked at 15,521 different men, the study found that the average length of a flaccid penis is 3.6 inches (9.16 cm, and 5.2 inches when stretched and still flaccid) while the average length of an erect penis is 5.2 inches (13.12 cm).

Of course, it's not all about length, there's also girth to consider. The average on that front was 3.7 inches (9.31 cm) when flaccid, while the average erect circumference was 4.6 inches (11.66 cm). The information was used to create a nomogram or graph of the average sizes, and what percentile the majority of people fall into.

The study does have a serious purpose, of course, apart from being used as a yardstick to measure from. As lead author Dr David Veale from the Institute of Psychiatry, Psychology & Neuroscience (IoPPN), King's College London and South London and Maudsley NHS Foundation Trust points out, the results will help men who suffer from Body Dysmorphic Disorder who are worried or concerned about the size of their penis.

Speaking to The Daily Mail, Dr. Veale said "Men compare themselves in locker rooms and with pornography on the internet and believe they are inferior. Some men have been teased by sexual partners about their length. There are lots of men who might be worried - and we think reassuring men they are in the normal range will help. We will also use the graphs to examine the discrepancy between what a man believes to be their position on the graph and their actual position, or what they think they should be."

Via The Daily Mail, The British Journal of Urology