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A new study reveals diminishing returns in the attractiveness to females of larger-than-average genitalia
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 type.
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.
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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.”
This article is reproduced with permission from the magazine Nature. The article was first published on April 8, 2013.
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2002, Action/Mystery & thriller, 2h 4m
It has an endearing lack of seriousness, and Vin Diesel has more than enough muscle for the starring role, but ultimately, XXX is a missed opportunity to breathe new life into the spy thriller genre. Read critic reviews
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Vin Diesel stars as former extreme sports athlete Xander "XXX" Cage, notorious for his death-defying public stunts. Betting he can succeed where other conventional spies have failed, Xander is recruited by NSA Agent Gibbons (Samuel L. Jackson) to become a different kind of undercover agent. Enlisted for a dangerous covert mission, he must use all his extreme skills to combat a clever, organized, and ruthless enemy far beyond the scope of his experience.
PG-13 (Language|Drug Content|Nonstop Action Sequences|Sensuality|Violence)
action, mystery & thriller, adventure
Dolby SR, DTS, Dolby Stereo, Surround, SDDS, Dolby A, Dolby Digital
Samuel L. Jackson
Agent Augustus Gibbons

Joel Hynek
Visual Effects Supervisor
Vin Diesel, every teen's fantasy action hero.
December 29, 2010 | Rating: 4/5 | Full Review…
If Dubya and Dick Cheney had made their very own post-9/11 patriotic propaganda movie for the teens they need as globalisation fodder, then this would be it.
Sporadically entertaining, this is nevertheless seriously hampered by a very choppy screenplay.
March 2, 2003 | Rating: 3/5 | Full Review…
Vin may not yet be a Bond, or a Terminator, or even Conan the Barbarian. But he's got presence and charisma.
November 19, 2002 | Rating: 3/5 | Full Review…
Diesel's a limited actor but a great performer - he just exudes cool. It's his charisma -- coupled with the raw sex appeal of Asia Argento's X girl -- that makes Rob Cohen's movie tick.
October 2, 2002 | Rating: 3/5 | Full Review…
The director piles on one expensive but impersonal action scene after another.
For every action sequence, there are shots dedicated to formulaic rips of the already tired spy subgenre.
November 9, 2020 | Rating: 3/10 | Full Review…
Groovy gadgets, deadpan quips and stunning set-piece stunts reign supreme in this expertly-made schlockbuster.
June 24, 2020 | Rating: 3/5 | Full Review…
Fun but deeply, ridiculously silly.
Despite the blatant rips, XXX's storyline remains entertaining enough.
September 8, 2009 | Rating: 3.5/5 | Full Review…
As an action director, Mr. Cohen is competent, but this film -- which is pretty much as non-stop as an action movie can get -- needed a director with a little more finesse.
July 14, 2007 | Rating: 2.5/4 | Full Review…
Okay, that's it. My summer of movies has been completely pissed on.
Vin Diesel, every teen's fantasy action hero.
December 29, 2010 | Rating: 4/5 | Full Review…
If Dubya and Dick Cheney had made their very own post-9/11 patriotic propaganda movie for the teens they need as globalisation fodder, then this would be it.
Sporadically entertaining, this is nevertheless seriously hampered by a very choppy screenplay.
March 2, 2003 | Rating: 3/5 | Full Review…
Vin may not yet be a Bond, or a Terminator, or even Conan the Barbarian. But he's got presence and charisma.
November 19, 2002 | Rating: 3/5 | Full Review…
For every action sequence, there are shots dedicated to formulaic rips of the already tired spy subgenre.
November 9, 2020 | Rating: 3/10 | Full Review…
Groovy gadgets, deadpan quips and stunning set-piece stunts reign supreme in this expertly-made schlockbuster.
June 24, 2020 | Rating: 3/5 | Full Review…
Fun but deeply, ridiculously silly.
Despite the blatant rips, XXX's storyline remains entertaining enough.
September 8, 2009 | Rating: 3.5/5 | Full Review…
As an action director, Mr. Cohen is competent, but this film -- which is pretty much as non-stop as an action movie can get -- needed a director with a little more finesse.
July 14, 2007 | Rating: 2.5/4 | Full Review…
Okay, that's it. My summer of movies has been completely pissed on.
Not since the days when Joel Silver ruled Hollywood and musclebound subliterates vied for supremacy on the big screen has the industry spawned a phenomenon as garish and confounding as Vin Diesel.
With all the stimulating action sequences you can ask for, a touch of class and some fine comedic moments, you'll leave the theater wanting more.
July 5, 2005 | Rating: 4/5 | Full Review…
Basically this is an American James Bond film made for 12 year olds, Full of over the top action which I never really liked as it ruins the whole film for me, But it's pretty fun at times, Predictable but fun, Maybe the age certificate didn't help in the action scenes though, Although it's pretty poor acted and the one liners and dialogue were pretty awful Vin Diesel was fun to watch as he wasn't a morbid, Croaky bore like he usually is he actually looked like he wanted to be there for once, The plot is Ripped off from every Bond film so we know what's going to happen and when, If I reviewed this when I was 12 I'd of given it 5 stars but age and maturity kicked in and it gets a solid 3 stars just for being brain dead fun.
If any future filmmakers are looking for inspiration in the guilty-pleasure high octane action genre, xXx is exactly the film to look into. What's not to like about it? Heck, even the horribly awful things are entertaining. Back when Vin Diesel decided not to come back to the Fast & Furious franchise, he chose to join F&F 1 director Rob Cohen in taking on another ridiculous action extravaganza, xXx. Now, the Fast & Furious franchise has figured out the right balance of lighthearted humor, bada** action sequences, and developed characters who we actually care about. xXx certainly has fun action, but that's about it. The humor is there, but in no way do I believe it's intentionally funny. And the characters are pretty awful. Or, at least the dialogue coming out of their mouths is awful. But does a film like this really need to have great dialogue? I guess not. Especially when it contains countless one-liners that do nothing but put a smile on my face from ear to ear. Essentially, this is just another Fast & Furious movie. Fast cars, explosions, women in scantily clad attire, incoherent plots, over-the-top villains, and catchy music. All are staples of the franchise, and Xander Cage's first film outing is no different. The supporting characters are fittingly absurd and bizzare, led by a prototypical performance from Samuel L. Jackson & an equally clichéd turn from Marton Csokas. I think the bottom line is, this movie is so far-fetched and insane that it works as one of the best mindless action adventures of the last decade. No one would believe a guy like Xander Cage would be recruited as an undercover agent in any sort of organization, but that's not really the point. xXx sets out to entertain, and that it does. +One-liners +Full-throttle action +Over-the-top -Really, really awful dialogue -Cliched -Does anyone actually care about these characters? 6.4/10
Gawd all frickin' mighty. How do people like Vin Diesel in these films? A clear candidate for most annoying action hero of all time. This is complete crap.
Some of the action scenes are okay but the story is dull and Diesel is no James Bond with the ladies. The kissing scenes are way too much to bear and these are extended shots. Rob Cohen is far from a great filmmaker and you only need to see how the dialogue is delivered to know he isn't looking for anything with substance. The avalanche scene is probably the most memorable thing about this dull misfire that was looking to kickstart a new franchise. This film might appeal to the fast and furious crowds but anyone else will find nothing but boring Diesel attempts at being a central character. Riddick is the only character I've enjoyed. 07/07/2017.
I've been undercover here for two years.
Two years? What was your plan? To let them die of old age?
I want you to meet some people and find out whatever you can about them.
Dirty. Dangerous. Tattooed. Uncivilized. Your kind of people.
You've gotta be kidding me! You already broke me, you don't have to get cruel and unusual.
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