Eight Scientific Truths About Human Penis Size

Because our society shares more myths than scientific truths about the length of the penis, l want to be clear on what the truths are:

Eight Truths about the Length of the Human Penis

Truth#1, the newborn’s penis is about 1.3 inches in length.

Truth#2, The greatest growth spurt for the penis occurs between 10 and 13 years of age.

Truth#3, The penis typically stops growing by age 16.

Truth#4, The average length of an adult’s flaccid (non-erect) penis is about 3.6 inches.

Truth#5, The average length of an adult’s erect penis is about 5.2 inches.

Truth#6, Seventy-five percent of erect penises are between 4.3 and 5.9 inches in length.

Truth#7, Ten percent of males have erect penises less than 4.3 inches in length.

And Truth#8, Fifteen percent of males have erect penises greater than 5.9 inches in length.

Veale, D., Miles, S., Bramley, S., Muir, G. & Hodsoll, J. (2015). Am I normal? A systematic review and construction of nomograms for flaccid and erect penis length and circumference in up to 15,521 men. British Journal of Urology International, 115, 978–986.

For a comprehensive paper about the male’s sexual anatomy as it relates to pleasure and reproduction, check this out: https://humansexuality.medium.com/the-anatomy-of-male-pleasure-and-reproduction-adee30d63a11
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Dr. Don Lucas, Ph.D. is a Professor of Psychology and head of the Psychology Department at Northwest Vista College in San Antonio Texas. He loves psychology, teaching, and research.