8 Wild Facts About the PenisUploader: Grogore 5 years ago Subscribe 10
A male will alter the number of sperm he inseminates into a female according to his perceived level of sperm competition,  inseminating a higher number of sperm if he suspects a greater level of competition from other males. In this way, an improved arterial flow is achieved. An erection is the stiffening and rising of the penis, which occurs during sexual arousal , though it can also happen in non-sexual situations. Volume 4, Reproductive Fitness. External male genitalia of Papio hamadryas and Chlorocebus pygerythrus. Internet URLs are the best.
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