Size matters but some people seem to obsess over it to the point of lying or bragging. Some men lie about their height, giving an exaggerated number while others might hum and haw before declaring themselves to be six feet tall. It's the same when men report penis size. 

A study looked into this phenomenon and discovered that self-reported 'bodily markers' are frequently overestimated. The researchers who published their findings in the journal, Frontiers in Psychology also considered whether participants would be more honest if they were simply paid more. 'Bodily markers' such as height, weight and penis size were particularly chosen because they were "linked to masculinity." The researchers examined existing data on the psychology of some people's obsession with penis size and concluded that many men believe that size matters. The team also mentioned how men on dating sites frequently use exaggerated height to "boost their chances on the mating market."

"The current work contributes to the literature not so much regarding if participants would exaggerate certain male markers of masculinity but rather the magnitude of this exaggeration," the study said in its introduction. "All self-report measures except weight were consistently found to be above the population mean (height and penis size) or the scale midpoint (athleticism). Additionally, the participant pool that received the lower (vs. higher) monetary reward showed a particularly powerful deviation from the population mean in penis size and were significantly more likely to report their erect and flaccid penis size to be larger than the claimed but not verified world record of 34 cm."

These findings indicate that studies relying on men's self-reported measures of certain body parts should be interpreted with great caution and higher monetary rewards seem to improve data quality slightly for such measures. The researchers and authors of the study discovered that the average self-reported penis size was 21.1 percent larger than the overall Danish population mean. The study concluded, "It is possible that men, on average, are more inclined to lie about their penis size than their height, weight or athleticism, considering that the penis is typically concealed and hence easier to lie about without getting caught in everyday interactions whereas people cannot easily hide their height, weight, and body shape. This study could make one question the reliability of the claims made by men, especially about things associated with popular notions of masculinity and it definitely suggests that men are delusional about their bodies.