Penis size and sperm count

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Penises play a key role in sperm transport and in stimulating female genitals. This should impact post-copulatory competition, and expose penis characteristics to sexual selective pressures. Studies of male genitalia have repeatedly reported negative static allometries, which mean that, within species, large males have disproportionally small genitals when compared with smaller individuals. Males of some sperm-storing bat species may stand as an exception to such a pattern by arousing from hibernation to copulate with torpid females.
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Penis size and sperm quality, are all bats grey in the dark? | Current Zoology | Oxford Academic

Potentially, the chemicals could lead to male infertility. The problem has been seen near military installations nationwide, and a number of communities closed their drinking water supplies in Environmental contaminants potentially play a role in the trend. Bailey King PhillyVoice Staff.
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Guys Are Right: Size Matters, When It Comes to Fertility

A recent study suggested that penis size might be a cause of infertility. However, experts say the research has a number of flaws. Scientists are struggling to find out why, across the globe, men are becoming increasingly less fertile.
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New research indicates size — of a sort — does matter when it comes to male fertility. More on Time. Fertility testing is nothing if not invasive, but the research, from the University of Rochester Medical Center, means that the latest tool in the fertility arsenal might soon be a lowly tape measure. AGD is associated with semen volume and sperm count, according to study author Shanna Swan, a reproductive epidemiologist and professor in obstetrics and gynecology at the University of Rochester.
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