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Bigger not always better for penis size [儿童不宜,慎入]

(2013-04-10 13:22:56)
标签:

penis

大小

吸引

性感

it

分类: science
美国科学院院报(PNAS)最新文章讨论了男人和女人共同关心的一个问题---女人对铅笔大小的倾向。
方法是让一堆异性恋的女人看不同体型男人的计算机图片,然后打分。他们的结论中规中矩。报道如下,红色部分的评论是我认为是这个研究最大的问题所在。他的建议很好,但是就性吸引本身来说,对于人类已经不仅仅是一个biology的概念,所以我相信这方面的争论还会继续下去。厕所和公共澡堂里的比较也还会依然继续。这种混合了社会学,人类学,心理学,进化论的问题,总是似是而非,引起大家的眼球,但总是没有最后的结论,呵呵。

免责声明:文章中的具体的长度数据请不要作为择偶/评价之参考。鉴于实验是在澳大利亚做的,而不同人种之间据说也许不可比较,本博转载本文并不意味着同意或者证实上述数据的真实或者可靠。本博不承担基于上述数据的任何判断和行为所造成后果之任何责任。

--------------------------转载 ------------------------------------

http://www.nature.com/news/bigger-not-always-better-for-penis-size-1.12770

Bigger not always better for penis size

Study reveals diminishing returns in attractiveness of larger-than-average genitalia.

08 April 2013
http://www.nature.com/polopoly_fs/7.9884.1365446907!/image/pnas_fig1-630.jpg_gen/derivatives/landscape_300/pnas_fig1-630.jpgnot always better for penis size [儿童不宜,慎入]" />

These computer-generated figures illustrate an average male figure (center) flanked by extreme variations.

REF. 1.

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Researchers report today that penis size does matter to women — though within limits. The finding suggests that women’s preferences could have fuelled the evolution of the human male penis, which is longer and thicker than that of any other primate.

Male genitalia evolve quickly. They diversify earlier than other physical traits, with a wide variation in size and shape across the animal kingdom that can reveal a species’ evolutionary pressures. Biologists have puzzled, therefore, over what factors might have caused the human penis to become so large.

Now, a study published in the Proceedings of the National Academy of Sciences finds that women consider penis size and height equally when judging men’s attractiveness, but both exhibit diminishing returns with greater size and are less important than a masculine body type1.

The findings add to a debate that began in 1966 when sexuality researchers William Masters and Virginia Johnson declared penis size to be unimportant to most females. Subsequent studies of women’s preferences, based on questionnaires or line drawings, have reported conflicting results.

For the latest study, researchers developed computer-generated images of males that varied independently in three factors: height, shoulder-to-hip ratio and penis length. A sample of 105 heterosexual Australian women each viewed life-sized projections of 53 of the images and rated their sexual attractiveness.

Too big to succeed?


The data showed an upside-down-U-shaped curve for each trait. The women considered taller men with a more masculine body type (indicated by a larger shoulder-to-hip-size ratio) and longer penis to be more attractive, but not without limits — there were diminishing returns for extreme size, and men with substantially larger-than average features were not found much more attractive than those with only slightly above-average features.


Study leader Brian Mautz, a biologist now at the University of Ottawa in Canada, says that there seems to be a ceiling effect for each trait — a point of theoretical peak attractiveness, beyond which women’s ratings will begin to decline. The team’s model predicts that the most attractive penis would measure 12.8–14.2 centimetres in its flaccid state. Mautz notes that this ideal size is relatively closer to the population average (of 9 centimetres) than are the predicted ideals for the other traits, implying that women prefer more extreme shoulder-to-hip ratio and tallness but less extreme penis size.

Other researchers say that the findings are an important first step but fall short of showing a role for sexual selection in the evolution of human penis size, a point that Mautz concedes. “It's hard to extrapolate much from the data,” he says. ”More work needs to be done to connect the dots.”

Alan Dixson, a primatologist at Victoria University of Wellington in New Zealand, says that the research should be broadened to include women from other countries and cultures — especially those from indigenous populations in which full clothing is not usually worn.

More crucially, female preference needs to be tied to reproductive success, says William Eberhard, an evolutionary biologist at the University of Costa Rica in San Pedro. Women may prefer a large penis when choosing a partner, but that doesn’t necessarily translate into more offspring who carry those genes.

Still, the findings have immediate implications for sexual medicine and counselling, says Geoffrey Miller, an evolutionary psychologist at New York University. “This research will allow an uncomfortable subject to become a legitimate topic of discussion.”

Nature
 
doi:10.1038/nature.2013.12770

References

  1. Mautz, B. S.Wong, B. B. M.Peters, R. A. Jennions, M. D. Proc. Natl Acad. Sci. USAhttp://www.pnas.org/cgi/doi/10.1073/pnas.1219361110 (2013).



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