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Penis size is of great concern to many people. Some consider having a large penis a mark of masculinity; others are concerned that their penis is too small to satisfy their sexual partner(s). These insecurities have led to many erroneous beliefs about penis size and to the creation of a whole industry devoted to penis enlargement.
Compared to other primates, even larger primates such as the gorilla, the male human genitalia are remarkably large. The human penis is both longer and thicker than that of any other primate both in absolute terms and in relative size compared to the rest of the body.[1]
Measuring the penis
There are different ways to measure and some difficulties to overcome while doing so. First of all, a penis must be maximally erect before measurement, and in a clinical setting this is difficult to achieve. At least one Brazilian doctor resorted to injecting penises with drugs to induce an erection, giving much more consistent results.[2] Some clinicians measure the penis by stretching the flaccid penis as far as comfortably possible and take the measurement based on the theory that a fully stretched flaccid penis is equal to an erect penis length. Relying on self-reporting of penis size is problematic, since some patients exaggerate or are unable or unwilling to measure the penis correctly.
Penis length
The length is typically measured with the subject standing and the penis held parallel to the floor. Measurement of length goes horizontally along the top of the penis from the penis's bottom to the tip. If the penis is measured along the bottom or underside, the result is less reliable. Measurements taken while sitting or lying down also tend to be unreliable.[3]
Penis circumference
Penis circumference or girth is measured by using a tape measure. It is variously quoted as an average, at 3 places along the penis: just below the penile head, in the middle of the shaft, and at the base or the thickest part.[4]
Studies on penis size
There have been several studies regarding the average size of the human penis. The majority of such studies could be unreliable due to self-selection bias: men with a smaller than average penis might be less likely to allow themselves to be measured, while men with a larger than average penis might be more likely to allow themselves to be measured. It is unknown if this conjectured self-selection bias has been confirmed by any studies, or if any studies have attempted to account for potential self-selection bias regarding penis size.
Size at birth
Average stretched penile length at birth is about 4 cm (1.6 in), and 90% of newborn boys will be between 2.4 and 5.5 cm (0.9 and 2.2 in). Limited growth of the penis occurs between birth and 5 years of age, but very little occurs between 5 years and the onset of puberty. The average size at the beginning of puberty is 6 cm (2.4 in) with adult size reached about 5 years later. W.A. Schonfeld published a penis growth curve in 1943.[5]
Erect length
Frequency graph of LifeStyles dataPercentile plot of LifeStyles dataRegarding the length of the adult fully erect penis (measured along the top of the penis from the groin to the tip), several studies have been performed. Studies that have relied on self-measurement, including those from Internet surveys, consistently reported a higher average than those that used medical or scientific researchers to perform the measurements.
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