M I know that sounds silly but they really do help. In Stang J, Story M ed. Start at: Myth or reality? Similar results exist regarding studies of the circumference of the adult fully erect penis, with the measurement usually taken mid-shaft.
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The following staff-measured studies are composed of different subgroups of the human population in other words, specific age range or race; selection of those with sexual medical concerns or self-selection that could cause a sample bias. There are different kinds, including some that are all natural. Suggest Categories.
Archives of Sexual Behavior.