Researchers at Indiana University released a study on the size of men's genitals, and it may be the most-accurate results on record.
The study found that the average American male's penis is 5.57 inches long when he is fully engorged.
Why is this more accurate than other studies? In previous surveys, size was measured by the men themselves, not researchers. In other words, the data depended on men being honest about themselves.
The smallest reported size in this study was 1.57 inches when fully engorged, and the largest was 10.24 inches.