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In humans, the AR gene located on the X chromosome at Xq11-12 which may determine the penis size.The SRY gene located on the Y chromosome may have a role to play.
Some environmental factors in addition to genetics, such as the presence of endocrine disruptors, can affect penis growth.
An adult penis with an erect length of less than 7 cm (2.8 in), but otherwise formed normally, is referred to in medicine as a micropenis.
Studies that have relied on self-measurement, including those from Internet surveys, consistently reported a higher average length than those that used medical or scientific methods to obtain measurements.
The following staff-measured studies are composed of different subgroups of the human population (i.e., specific age range or race; selection of those with sexual medical concerns or self-selection) that could cause a sample bias.
Measurements vary, with studies that rely on self-measurement reporting a significantly higher average than those with a health professional measuring.
As of 2015 Flaccid penis length is generally a poor predictor of erect length.
An incorrect saddle may ultimately cause erectile dysfunction (see crotch pressure for more information).
Neither age nor size of the flaccid penis accurately predicted erectile length.
Stretched length has correlated with erect length in some cases.
Scientific studies have been performed on the erect length of the adult penis.
Some of the identifiable causes are deficiency of pituitary growth hormone or gonadotropins, mild degrees of androgen insensitivity, a variety of genetic syndromes and variations in certain homeobox genes.Tags: Adult Dating, affair dating, sex dating