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In 2015 the world's first successful penis transplant took place in , South Africa in a nine-hour operation performed by surgeons from and.

It is usually accompanied by.

Neither age nor size of the flaccid penis accurately predicts erectile length.

high sperm competition can cause males to produce a greater amount of motile sperm than when viewing a sexually explicit image depicting exclusively three females i.

The human testicles are moderately sized when compared to other animals such as gorillas and chimpanzees, placing somewhere midway.

Ein 30 Meter langer Wal ist mit einem extrem gigantischen Penis ausgestattet.

who undergo such surgery have a.

During erection, these centers block the relaxation of the sphincter muscles, so as to act as a physiological separation of the excretory and reproductive function of the penis, and preventing urine from entering the upper portion of the urethra during ejaculation.

This, however, is not the case in monogamous societies, where a reduction in fertilising ejaculations has no effect on reproductive success.

If sperm competition results in the rival male's sperm fertilising the egg, could occur.

Female ratings of attractiveness for each male revealed that larger penises were associated with higher attractiveness ratings.