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Harcourt, A. H.; Harvey, P. H.; Larson, S. G.; Short, R. V. (1981). "Testis weight, body weight and breeding system in primates". Nature. 293 (5827): 55–57. Bibcode: 1981Natur.293...55H. doi: 10.1038/293055a0. PMID 7266658. S2CID 22902112. Jones, Richard E.; Lopez, Kristin H. (28 September 2013). Human Reproductive Biology. Academic Press. p.352. ISBN 978-0-12-382185-0. Anybody who suspects they may have Peyronie’s disease should seek medical advice. Sometimes, people with the condition who experience no other issues, such as pain, could still use their penis for sexual activity without needing medical treatment.
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Harcourt, A. H.; Purvis, A.; Liles, L. (1995). "Sperm competition: Mating system, not breeding season, affects testes size of primates". Functional Ecology. 9 (3): 469–476. doi: 10.2307/2390011. JSTOR 2390011.In addition, males can—and do—adjust their ejaculates in response to sperm competition and according to the likely cost-benefits of mating with a particular female. [45] Research has focused primarily on two fundamental ways in which males go about achieving this: adjusting ejaculate size and adjusting ejaculate quality. Other practices that alter the penis are also performed, although they are rare in Western societies without a diagnosed medical condition. Apart from penectomy, perhaps the most radical of these is subincision, in which the urethra is split along the underside of the penis. Subincision originated among Australian Aborigines, although it is now done by some in the U.S. and Europe.
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thelondoneconomic.com - TLE, International House, 24 Holborn Viaduct, London EC1A 2BN. All Rights Reserved. Schultz, W. W.; van Andel, P.; Sabelis, I.; Mooyaart, E. (December 18, 1999). "Magnetic resonance imaging of male and female genitals during coitus and female sexual arousal". BMJ. 319 (7225): 1596–600. doi: 10.1136/bmj.319.7225.1596. PMC 28302. PMID 10600954.An erection is the stiffening expansion and orthogonal reorientation of the penis, which occurs during sexual arousal. Erections can occur in non-sexual situations; spontaneous non-sexual erections frequently occur during adolescence and sleep. In its flaccid state the penis is smaller, gives to pressure, and the glans is covered by the foreskin. In its fully erect state, the shaft becomes rigid and the glans becomes engorged but not rigid. An erect penis may be straight or curved and may point at an upward angle, a downward angle, or straight ahead. As of 2015 [update], the average erect human penis is 13.12cm (5.17in) long and has a circumference of 11.66cm (4.59in). [2] [3] Neither age nor size of the flaccid penis accurately predicts erectile length. There are several common body modifications to the penis, including circumcision and piercings. Penile curvatures are common and typically benign. They are rarely painful and do not usually make penetrative sex more difficult.
