Gird your loins, gentlemen, because the truth is out: women really are measuring you up when it comes to your manhood.
In a study carried out on penis size, along with a man’s height and body shape, the evidence was clear – what women want is a larger lunch box.
Equally, men who looked at a figure with a fulsome phallus found them more intimidating as a sexual rival and fighting opponent.
“Men rated rivals with larger penises as more physically threatening and sexually competitive,” said Dr Upama Aich, who led the study at the University of Western Australia.
Evolutionary biologists have long been puzzled by the human penis, which is larger relative to body size than any other primate and would have been a highly visible feature prior to the invention of clothing. This research, published in PLOS Biology, honed in on whether size could also increase a male’s attractiveness to females or reduce the likelihood of fights with other males by signalling higher testosterone levels and therefore greater fighting ability.
Researchers asked more than 600 men and 200 women, participating in the study, to rate computer-generated male figures which varied in height, body shape, and penis size. Women were asked to judge based on sexual attractiveness. Men were asked to assess how threatening they found them, both in terms of fighting ability and as a sexual rival. Participants either viewed lifesized images of the figures in person, or scaled images in an online survey.
The female participants found male figures, which were taller, had a higher shoulder-to-hip ratio (indicating a more V-shaped body) and a larger penis more attractive. The male participants also favoured taller figures which had a more V-shaped body and a larger penis in their assessment of threat as sexual rivals and fighting opponents.
However, while the men’s threat assessment grew continuously in line with penis size, women were a little more discerning. Beyond a certain point, further increases in penis size, height and shoulder breadth had diminishing benefits in terms of attractiveness for women.
Researchers say the study provides the first experimental evidence that males consider penis size when assessing sexual and combat rivals although height and body shape had a greater influence.
Dr Aich said: “Men rated rivals with larger penises as more physically threatening and sexually competitive.”
Co-author, Michael D Jennions, added: “While the human penis functions primarily to transfer sperm, our result suggests its unusual large size evolved as a sexual ornament to attract females rather than purely as a badge of status to scare males, although it does both.”
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