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Focus On: Human Anatomy: Human Penis, Human Body, Human Skeleton, Foreskin, Abdomen, Composition of the human Body, Fingerprint, Human Tooth, Groin, Anatomical Terminology, etc. - Kindle edition by Wikipedia contributors. Reference Kindle
Wikipedia says 'an average size of the human penis is 5.21 inches when erect for 90% of men.' Is it true? - Quora
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