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Distribution of penis sizes by length. 45% of erect penises are between 12 and 14 cm long. [2] Distribution of penis sizes by circumference. 81% of erect penises (green) are between 10 and 13 cm in circumference. [2]
Among all primates, the human penis is the largest in girth, but is comparable to the chimpanzee penis and the penises of certain other primates in length. [13] Penis size is affected by genetics, but also by environmental factors such as fertility medications [14] [unreliable medical source?] and chemical/pollution exposure.
It has been suggested the evolution of the human penis towards larger size was the result of female choice rather than sperm competition, which generally favors large testicles. [27] However, penis size may have been subject to natural selection, rather than sexual selection, due to a larger penis' efficiency in displacing the sperm of rival ...
A micropenis or microphallus is an unusually small penis. A common criterion is a dorsal (measured on top) penile length of at least 2.5 standard deviations smaller than the mean human penis size for age. [1] A micropenis is stretched penile length equal to or less than 1.9 cm (0.75 in) in term infants, and 9.3 cm (3.67 in) in adults.
XX male syndrome, also known as de la Chapelle syndrome, is a rare intersex condition in which an individual with a 46,XX karyotype develops a male phenotype. [2] Synonyms for XX male syndrome include 46,XX testicular difference of sex development (or 46,XX DSD) [3] [4] [5] [6]
Males become externally distinct between 8 and 12 weeks, as androgens enlarge the genital tubercle and cause the urogenital groove and sinus to fuse in the midline, producing an unambiguous penis with a phallic urethra, and the labioscrotal swellings become a thinned, rugate scrotum where the testicles are situated. Dihydrotestosterone will ...
It wouldn't be 'Sex Education' without a phallic visual gag, and Season 4 shows Asa Butterfield's Otis accidentally revealing dick pics to his class.
A penis (/ ˈ p iː n ɪ s /; pl.: penises or penes) is a male sex organ that is used to inseminate female or hermaphrodite animals during copulation. [1] [2] Such organs occur in both vertebrates and invertebrates, including humans, but not in all male animals. [3] The term penis applies to many intromittent organs, but not to all.