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When we research the physiology of this human being penis, we observe two systems are clearly distinguished, the shaft regarding the penis plus the glans. The swelling associated with glans as well as the perpendicular arrangement for the top of the identical is a good regarding the male. In accordance with an investigation study by Gordon G. Gallup, Jr. “Sperm Displacement as being a Sperm Competitors Strategy in individuals” argue that the penis that is human really produced by carrying this out to replace the semen of opponents in sperm competition. Evaluating the research, it may be seen that the physiology of this peoples penis has really evolved become presented straight into the woman’s genital area since well as, throughout sexual activity, the mission associated with glans will be drawn right out of the genital area the ejaculate of some other male if there was clearly one, leaving the entryway of this womb liberated to later on inseminate the woman along with her really own semen.