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    25.10.2017

    Precopulatory processes can influence genital morphology 4 , 5 , but it is unknown whether these results are due to direct female choice or sexual conflict. Third, there might be a size contrast effect such that female assessment of attractiveness varies if the trait of interest is viewed differently in relation to other traits, analogous to the Ebbinghaus—Titchener effect These studies, however, all use self-reported, direct questioning and are therefore susceptible to biases of self-censorship and pressure to conform to socially desirable responses to sensitive issues e. Furthermore, novels, magazines, and popular articles often allude to the existence of a relationship between penis size and sexual attractiveness or masculinity 21 , This observation has generated suggestions by evolutionary biologists that the comparatively large human penis evolved under premating sexual selection 19 , For example, does a given increase in penis length have an equivalent effect on the attractiveness of a short and tall man? Before clothing, the nonretractable human penis would have been conspicuous to potential mates. In addition, the use of small photographs to quantify size-based preferences might lead to different estimates than those obtained when viewing fully life-sized male bodies.

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    The upright body posture and protruding, nonretractable genitalia of male humans make the penis particularly conspicuous, even when flaccid. Positive linear selection was detected for penis size, but the marginal increase in attractiveness eventually declined with greater penis size i. This observation has generated suggestions by evolutionary biologists that the comparatively large human penis evolved under premating sexual selection 19 , Humans mate assortatively based on numerous traits, including height 15 , facial symmetry 16 , and body shape 17 , These important studies were not designed to quantify directly the relative effect of penis length on attractiveness compared with other sexually selected male traits, such as height and body shape 30 — For example, does a given increase in penis length have an equivalent effect on the attractiveness of a short and tall man? Many cultures have fashion items, like penis sheaths and codpieces, that draw attention toward male genitalia 20 , highlighting the potential for female choice to influence the evolution of male genitalia. Therefore, it is still unknown whether penis size affects attractiveness when there is substantive variation in other, arguably more important, body traits, or whether interactions between these traits and penis size determine net attractiveness. There might, however, also be premating sexual selection on male genitalia. This observation has generated suggestions that human penis size partly evolved because of female choice. First, females use multiple cues during the mate choice process 9. There was a similar increase in the positive effect of penis size on attractiveness with a more masculine body shape i. Furthermore, novels, magazines, and popular articles often allude to the existence of a relationship between penis size and sexual attractiveness or masculinity 21 , Despite this potential effect, relatively little research has tested whether primary sexual characters influence male attractiveness 6 — 8. This variation is typically attributed to copulatory and postcopulatory sexual selection to increase male fertilization success under sperm competition 2 or cryptic female choice 3. Before clothing, the nonretractable human penis would have been conspicuous to potential mates. Precopulatory processes can influence genital morphology 4 , 5 , but it is unknown whether these results are due to direct female choice or sexual conflict. Penis size had a stronger effect on attractiveness in taller men than in shorter men. More broadly, our results show that precopulatory sexual selection can play a role in the evolution of genital traits. This article has been cited by other articles in PMC. The results are mixed, with studies finding that females prefer longer penises 23 , wider penises 24 , 25 , or that penis size is unimportant In addition, the use of small photographs to quantify size-based preferences might lead to different estimates than those obtained when viewing fully life-sized male bodies. Figure rating was conducted in the absence of an interviewer and was completely anonymous. Surprisingly, larger penis size and greater height had almost equivalent positive effects on male attractiveness. Third, there might be a size contrast effect such that female assessment of attractiveness varies if the trait of interest is viewed differently in relation to other traits, analogous to the Ebbinghaus—Titchener effect We tested for the effects of flaccid penis size, body shape shoulder-to-hip ratio , and height on male sexual attractiveness.

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