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What Is Normal Penis Size?

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Most men at some point want to know whether they
have an average size penis. How big is a normal penis?
Once and for all, we took a look at the actual scientific
studies on the issue.

Most men underestimate the size of their penis for one
simple reason--they measure it looking down. Second,
to get the most accurate measurements for a penis
size, you have to take several measurements at
different times, preferably with different erections on
different days. Then average these figures together.

Why? Your penis changes size. It is bigger when your
arousal is bigger. It is bigger when the temperature of
the room is warmer. It is bigger , for some men, in the
mornings. So, taking measurements at different times
of the day helps too account for what may be natural
variability in size of your penis due to factors such as
arousal level, time of day, room temperature, and
frequency of sexual activity, and unreliability of the
methods you use to measure your penis.

Article Continues Below



















Length
The length of your penis can be measured with the
subject standing and the penis held parallel to the
floor. The penis is measured along the top, from the
base to the tip. Results are inaccurate if the
measurement is taken along the underside of the
penis, or if the subject is seated or prone.


Thickness--Circumference
Long penis, no width makes for a pencil dick. Penis
girth is the measurement of the circumference of the
completely erect penis. It is variously quoted as an
average of three measurements: just below the glans
penis, in the middle of the shaft, and at the base.[2]


Problems
A penis must be completely erect in order to obtain an
accurate measurement. This may be difficult to achieve
in a clinical setting. At least one Brazilian doctor
resorted to injecting penises with drugs to induce
erection, which gave more consistent results.[4] Some
clinicians measure the penis by stretching the flaccid
penis as far as comfortably possible. Self-reported
measurements tend to be unreliable because men
often want to report a larger penis size.


The Bottom Line From Studies on Penis Size
How big is an average penis? While results vary across
studies, the consensus is that the average human
penis is approximately 5.1 to 5.9 inches (12.9–15 cm
for you Europeans) in length.

How thick is an average penis? The average thickness
is 4.85 inches around (12.3 cm) when fully erect.

Size at birth

The average stretched penile length (ouch!) at birth is
about 1.6 inches (4 cm), and 90% of newborn boys
will be between 0.9 and 2.2 inches (2.4 and 5.5 cm).

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 2.4 inches (6 cm) with adult
size reached about 5 years later, around age 17.

Size with aging

The good news is that your penis does not shrink with
age.  “Individual research studies have ... suggested
that penis size is smaller in studies focusing on older
men, but Wylie and Eardley found no overall
differences when they collated the results of various
studies [over a 60 year period].”[9]


Erect length
Several scientific studies have been performed on the
erect length of the adult penis. Studies which have
relied on self-measurement, including those from
Internet surveys, consistently reported a higher
average length than those which used medical or
scientific methods to obtain measurements .

The following staff-measured studies are each
composed of different subgroups of the human
population (i.e. specific age range and/or race;
selection of those with sexual medical concerns or self
selection) which may meet the definition of possible
sample bias.

For the Scientific Types Here Is a Summary of the
Studies

A study published in the September 1996 Journal of
Urology concluded that average erect length was 12.9
cm (5.08 in) (measured by staff).[5] The purpose of
the study was to “provide guidelines of penile length
and circumference to assist in counseling patients
considering penile augmentation.” Erection was
pharmacologically induced in 80 physically normal
American men (varying ethnicity, average age 54). It
was concluded: “Neither patient age nor size of the
flaccid penis accurately predicted erectile length.”

A study published in the December 2000 International
Journal of Impotence Research found that average
erect penis length was 13.6 cm (5.35 in) (measured
by staff).

Quote: "The aim of this prospective study was to
identify clinical and engineering parameters of the
flaccid penis for prediction of penile size during
erection." Erection was pharmacologically induced in
50 Jewish Caucasian patients who had been evaluated
for Erectile dysfunction (average age 47±14y).
Patients with penis abnormalities or whose ED could
be attributed to more than one psychological origin
were omitted from the study.

A study conducted by LifeStyles Condoms found an
average of 14.9 cm (5.9 in) with a standard deviation
of 2.1 cm (0.8 in) (measured by staff).The purpose of
this study was to ensure properly sized condoms were
available.

401 college students volunteered to be measured
during 2001 Spring Break in Cancún, Mexico, of which
300 gained an erection to be clinically measured
(without pharmacological aid). The 300 effective
measurements makes this study double the size of any
prior study that uses medical staff to measure penis
size.

Erect circumference
A study conducted by LifeStyles Condoms during 2001
Spring Break in Cancún found an average of 12.6 cm
(5.0 in) with a standard deviation of 1.3 cm (0.5 in).

Similar results exist regarding studies of the
circumference of the adult fully erect penis, with the
measurement taken mid-shaft. As with length, studies
that relied on self-measurement consistently reported
a higher average than those with staff measuring.


Flaccid length
One study found the mean flaccid penis length to be
3.5 inches measured by staff). Length of the flaccid
penis does not necessarily correspond to length of the
erect penis; some smaller flaccid penises can grow
much larger, and some larger flaccid penises cannot
grow much larger.

The penis and scrotum can contract involuntarily in
reaction to cold temperatures or nervousness,
referred to by the slang term "shrinkage", due to
action by the cremaster muscle.

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Normal Penis Size
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