Penis Enlargement Products Come up Short | LiveScience
Men who think they don't measure up often have an outsized idea of what's normal. ... In vaginal sex, any erect penis longer than 4 inches is usually big enough to stimulate erogenous tissue in the vagina. A penis longer than 8 inches can ram into the cervix and cause discomfort.
Average Penis Size
A: Here are the statistics on erect penis lengths for white college men, in quarter-inch lengths measured by The Alfred C. Kinsey Institute for Sex Research (from the point where the penis meets the body along the top to its tip):
Longer Penises Give Rodents Mating Advantage | LiveScience
A longer penis attracts the ladies, in the rodent world that is, according to a new study. ... The researchers compared the relative bone size of penises from several mammals to see if possessing a longer penis gave males an advantage in breeding.
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