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A very interesting essay from the journal of Evolutionary Psychology on sperm competition and its role in shaping the human penis, (size, length, width, forceful ejaculation), evolutionary strategies for successful fertilization i.e. semen displacement and coagulation. On sexual intercourse and evolutionary benefits of deep penis thrusting, function of the foreskin and effects of circumcision, premature ejaculation, female reproductive strategies i.e. copulation with multiple partners, human sexual behaviour and wife rape (males having sex with their partner if suspecting them of infidelity).
From the essay: 'What effect, if any, does the practice of surgically removing the foreskin have on the semen displacement properties of the human penis? For intact males, when the penis is fully erect the foreskin is pulled back over the glans and down the shaft of the penis. As a result, whether a man has been circumcised is often only apparent when the penis is flaccid. However, depending on how thick the foreskin is and how far it extends over the end of the glans, circumcision could affect the magnitude of semen displacement. During circumcision the foreskin is cut away from the shaft of the penis immediately behind the glans (Holman and Stuessi, 1999). As a consequence of removing the foreskin the circumference of the shaft posterior to the glans may be slightly reduced, causing the coronal ridge to be more pronounced and creating a larger area for semen to collect where it could be scooped back away from the cervix. ... Although practiced primarily for religious and/or hygienic reasons, an unintended consequence of circumcision may be to enhance the semen displacement properties of the human penis.'
By Gordon G. Gallup, Jr., Department of Psychology, State University of New York at Albany, Albany, NY 12222, USA.
Rebecca L. Burch, Department of Psychology, State University of New York at Oswego, Oswego, NY 13126, USA.
Read More: Evolution, Human Reproduction & Fertilization: Sperm Competition, Semen Displacement & Penis
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Analyse
any human emotion, no matter how far it may be removed from the sphere
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