Male genitalia is an interesting subject to research because it shows how the male reproductive system has evolved and adapted to different environments and pressures. One such example is the...
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: Why the human penis lost its bone a study in sexual evolution
The penis is an organ in male animals that serves for reproduction. It is also used during copulation to transfer sperm into the female reproductive system. In many species of mammals, there is a...
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: Penis, sexuality, males, reproduction, copulation, intercourse
