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Penis size an evolutionary perspective
my penis has shrunk with age
<<<<<<<<<<====== Penis size an evolutionary perspective =====>>>>>>>> 
By Victoria Woollaston for MailOnline. An evolutionary biologist has compared the sizes of human genitals to gorillas and apes to look at why there is such a discrepancy between the species. Gentlemen, if you've ever been concerned about the size of your penis, take comfort in the fact that no matter how small it seems, it is one of the largest in the primate world. An evolutionarh biologist has compared the sizes of genitals of humans to gorillas and apes to look at why there is such a discrepancy between the species.
And he concludes the human penis may have grown so long to make it more conspicuous to potential partners, or even as a way of cooling the body down. The relative size of the male reproductive organs across these species was discussed by evolutionary biologist Darren Curnoe in his latest 'How Did We Get Here?
Gorillas have small penises and small testicles, while chimps have medium-sized penises and large testicles. By comparison, human males have the longest penis and medium-sized testicles.
Well for the testicles it's pretty straight forward. He said that if a female is 'receptive to multiple males in each reproductive episode', it maximises her chances of getting high-quality DNA. So the sperm of these males have to battle it out to fertilise her egg, hence chimps have very large testes that produce a very large number of sperm in each ejaculate.
The opposite applies to gorillas, Professor Curnoe continued. A mature male, a silverback, has exclusive reproductive access to the females in his group so his testes are small because there is no 'sperm war'. Gorillas left have small penises and small testicles, while chimps right have medium-sized penises and large testicles. For testicles, this difference is explained by how societies are organised. Chimps have more competition so produce larger numbers penis size an evolutionary perspective sperm, but gorillas have a hierarchy so they don't need as much.
But he said there wasn't a discernible reason why there is so much variation in penis size between humans and great apes. It may be because we walk upright on two feet, making it more conspicuous to play a role in attracting more females. He added that the differences don't just stop there though. The chimpanzee penis has spines on it, designed to temporarily injure females when they mate in order to delay her from mating with other males pennis soon.
A study in discovered evidence to suggest humans once had spines penis size an evolutionary perspective their penises, but evolved to make them smooth. Researchers at Stanford University in California found a molecular mechanism that could explain why we lost a piece of non-coding DNA pens influences the expression of the androgen receptor gene involved in hormone signalling.
Professor Darren Curnoe said there wasn't a discernible reason why penis size varies so much between primates, but speculated it may be because men walk upright, making the penis conspicuous.
Or it releases heat when men walk to keep them cool. The penis in this image was pixelated by the researchers. It has long been thought humans evolved smooth penises after developed a more monogamous reproductive strategy than our ancestors. Our ancestors may have used penile spines in a similar penis size an evolutionary perspective to how chimps do, but how this change was made is not known. Geneticists recently studied cloaca penia to see how external genitalia forms and why evolutionay grow in different regions of the body in different animals.
Snake and lizard genitalia is derived from the same tissue that perspectivve hind legs, while mammalian genitalia derives from the tail bud. The embryonic cloaca - which eventually develops into the urinary and gut tracts - sends signals that tell nearby cells to form genitals. The cloaca's location determines which tissues receive these signals first.
In snakes and lizards, the cloaca is located closer to the lateral plate mesoderm, the same tissue that makes the paired limbs, receives the signal. The cells that turn into either a penis or a clitoris start on opposite sides of the persepctive. As the embryo forms, and it changes from a flat sheet to a 3D embryo, these cells meet. They then form a bud, which becomes genitalia.
During tests, the geneticists were even able to change the location of where the penis grew by tweaking the signals sent by cells. The views expressed in the contents above are those of our users and do not necessarily reflect the views of MailOnline. The moment raging London Bridge killer turned violent against evolutionay Muslims he called 'traitors and spies' - but when they reported him to police they were told MI5 already knew about him.
Evolutionaryy DO humans have such large penises? RELATED ARTICLES Previous 1 Next. Share this article Share. Share or comment on this article e-mail 1.
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The Evolution of Penis Size
Penis size: An evolutionary perspective | Ask Carole, Evolutionary Agony Aunt | Science | The Guardian
How to increase penis size permanently Establishing a reference range for penile length in Caucasian British men: Accordingly, women's minds can be aroused by creativity and evolutionafy sexually imaginative can be physically arousing, adding satisfying metaphorical inches to one's love penis size an evolutionary perspective. Please check your email and click on the link to activate your account. When compared with patriarchal chimps, the matriarchal bonobo is a far more sex-oriented ape. Filed under ResearchSuzanne Harvey.
Women Prefer Bigger Penises, May Have Shaped Evolution
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