sexual selection in humans

This is further complicated by the consideration that with larger body size, the skeleton of mammals becomes much more robust and massive (relatively speaking). However, these researchers also stated that a longer penis would be more capable of leaving semen in less-accessible parts of the vagina, making it more difficult for subsequent males to remove or displace the semen. [3] It has been suggested that sexual selection played a part in the evolution of the anatomically modern human brain, i.e. [49] When humans started to migrate away from the tropics, there was less-intense sunlight, partly due to clothing to protect against cold weather. Congratulations on this excellent venture… what a great idea! Thus, human females, who typically gestate one fetus at a time, have two nipples. As one article states, sexual selection is in essence a process which favors sexual displays for attraction, aggressiveness, dominance, size, and strength, and the ability to exclude competitors by force if necessary, or by using resources to win. The mismatch timing between biological puberty and age of social maturity in western society has a psychological expectation on children. In most mammals, including human females, the nipple is important for transporting milk from inside to outside of the body. A good rule of thumb for mammals is to have twice as many nipples as offspring that you produce at one time. 1.11 Wrapping Up: Why use sex to study biology? Miller argues that the rapid increases in brain size would have occurred by a positive feedback loop resulting in runaway selection for larger brains. Understanding sexual selection clarifies some human psychological sex differences. 10.6 Unconventional ways of finding a mate. Some have suggested that the evolution of the human penis towards a large size, both in length and diameter, has been the result of sperm competition. The Mating Mind By Geoffrey F. Miller Published by Anchor Books, 2001 ISBN 038549517X, 9780385495172, It will enhance any encyclopedic page you visit with the magic of the WIKI 2 technology. We use cookies to help provide and enhance our service and tailor content and ads. [55], Joseph Jordania suggested in 2011 that in explaining such human morphological and behavioral characteristics as singing, dancing, body painting, wearing of clothes, Darwin and proponents of sexual selection neglect another important evolutionary force, intimidation of predators and competitors with the ritualized forms of warning display, which uses the same arsenal of visual, audio, olfactory and behavioral features as sexual selection. I use WIKI 2 every day and almost forgot how the original Wikipedia looks like. [50], Anthropologist Peter Frost has proposed that sexual selection was responsible for the evolution of pigmentary traits of women in Northern and Eastern European populations. [23] Bearing these caveats in mind, levels of sexual dimorphism are generally seen as a marker of sexual selection. Since a human erection relies on a hydraulic pumping system, erection failure is a sensitive early warning of certain kinds of physical and mental ill health. Sexual selection in humans concerns the concept of sexual selection, introduced by Charles Darwin as an element of his theory of natural selection,[1] as it affects humans. 10.10 What’s up with the human female orgasm? 10.11 Is the brain another object of sexual desire? Under these conditions there was less photodestruction of folate, and so the evolutionary pressure stopping lighter-skinned gene variants from surviving was reduced.

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