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Scientific American is part of Springer Nature , which owns or has commercial relations with thousands of scientific publications (many of them can be found at www.springernature.com/us ). Scientific American maintains a strict policy of editorial independence in reporting developments in science to our readers.
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.
Cassandra Willyard and Nature magazine
Fionna M. D. Samuels and Liz Tormes
Rodolfo Bonnin and Leonard M. Gralnik | Opinion
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By Sammy Nickalls Published: Feb 9, 2017
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Once you see it, you can't unsee it.
When Alexis Boatfield got her senior portraits done back in 2015, she didn't notice one key element in the background: a massive dick above her head.
"This picture was all over Facebook a year ago," 19-year-old Boatfield told BuzzFeed . But no one seemed to notice the giant green penis, least of all Boatfield. She only saw it when her boyfriend pointed it out this week. "Oh so no one was gonna tell me there was a big ass penis behind my head for my senior pictures???" she tweeted afterwards.
Boatfield is now a student at Bowling Green State University ( someone alert Kellyanne Conway! ), so perhaps she can get some penis-free shots done when she graduates. At least she can rest assured that she's not the only one:
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When you're in your 20s, a lot of people have a lot of advice about all the formative dating experiences you'll have, and the impact they'll have on your romantic future. You know — the people you'll date in your 20s , the totally questionable people you'll date in your 20s , the Game of Thrones characters you'll date in your 20s . All these articles are great, but to me, they dodge the most important question: What about the wild and varied array of genitals that you'll meet in your 20s? What can you learn from the penises and vulvas you encounter in the wild during your untethered, formative years? And how can you put that knowledge to use for the rest of your life?
I believe that we stand to gain a lot knowledge about sex, dating, and life by thinking closely about the specific sets of genitals that swing into our lives and groins when we're in our 20s. And although I can't personally weigh in on the vulva issue, I am enough of a lay expert (ahem) in penises to pull together a definitive listing of the nine penises you'll meet (if you're into dicks and kinda casual about premarital sex) in your 20s.
In the same way that the American Film Institute lays out 100 films that you need to see to truly have a film education, here are nine penises that you need to see in order to truly learn about life and love (and also penises).
Defining Characteristics : Foreskin, a certain je ne sais quoi.
Most Common Reaction : "Je ne ai jamais vu un ceux d'avant!" ("I've never seen one of those before!")
Most Often Found Attached To : Someone who was born outside the U.S., or someone who was born in the U.S. whose parents are into reiki and hemp-based shampoos.
How It Will Enrich Your Life : There's a lot of needless fear of foreskins out there, usually from people who have never seen one in real life and thus speak of them in strange, hushed tones, as if they were an urban legend like the Chupacabra. But once you tangle with the Continental, you'll learn that all the schoolyard myths about uncircumcised penises are a lie. They're not unclean, they look exactly the same as circumcised penises once they're erect, and frankly, they're way more sensitive to handjobs, et al . With U.S. circumcision rates falling each decade, you might as well learn to get comfy with our perma-turtlenecked friends. And hey, with the Continental, even if you've never been abroad, at least you can bone like you have!
Defining Characteristics : A lack of stature, accompanied by a real chip on the shoulder/dick.
Most Common Reaction : "Please stop asking me about the penis size of every other guy I have dated."
Most Often Found Attached To : Someone who has been bragging to you about the size of their penis. How It Will Enrich Your Life : The Napoleon isn't just about a small penis — it's about a lifestyle, one built around aggressively overcompensating for a small penis in every way possible. Going a few rounds with a Napoleon will teach you that, despite the bad buzz, small penises are actually fine. What truly determines a sexual experience is the partner attached to them. And the guy attached to the Napoleon has dedicated his whole life to trying to make up for his diminutive junk, from his rad car to his attempts to push your legs behind your ears in bed just to let you know that he is a sophisticated lover. The Napoleon sucks in bed, and banging one will teach you that this has little to do with the equipment, and everything to do with the operator.
Defining Characteristics : A slight list to the left or right when erect, like a Leaning Tower of Boner.
Most Common Reaction : "Huh! Does that hurt at all?"
Most Often Found Attached To : Any penis-haver around. How It Will Enrich Your Life : Though a serious curve (called Peyronie's Disease ) can be painful for the penis-haver, a small curve is a fun reminder that penises vary in all sorts of interesting ways, just like vulvas. As a friend once told me, "Curved penises just make you a little more interesting, like having a faint British accent." I have also heard some unconfirmed reports that certain types of penile curves can be especially sexually stimulating. If you have personal experience, let me know, and possibly send a detailed drawing.
Defining Characteristics : Confusion. It is about to have an orgasm, or does it need about 15 more minutes of banging? Does it want to have intercourse, or does it just want to lie down and call it an early night?
Most Common Reaction : "We could, you know, just cuddle if you want."
Most Often Found Attached to : Guys who are feeling nervous, guys who are on some medication (or "medication") that delays ejaculation as a side effect . How It Will Enrich Your Life : If the Undecided Voter in your life is attached to someone you really care about, time spent with this lil' flip-flopper can help you remember that sex isn't a super serious life-or-death situation during which everything has to go perfectly. Sometimes, it's OK to call for a recess, go eat some corn chips, and try again in an hour. If the Undecided Voter is part of a random hookup, it's a good opportunity to practice asserting yourself. Not game to keep trying over and over and over again? Tired of having your vag pounded for the 45th straight minute because he's "almost there"? Speak up! Don't beat around the bush, and don't let the Undecided Voter beat around your bush, either.
Defining Characteristics : A gorgeously even tone. A smooth, almost silken texture. A form so beautiful, you'll swear you saw this penis carved in marble on your 8th grade class field trip to the art museum.
Most Common Reaction : "Are you sure you want to have sex with me? Shouldn't you be having sex with a princess or Penelope Cruz or something?"
Most Often Found Attached To : Anyone! There's no way to tell just by looking at someone, which is part of what makes life such a thrilling adventure! How It Will Enrich Your Life : For one brief moment, when you first touch your partner's David, you will be convinced that everything that has ever happened to you in life was all a part of God's plan, which was to bring this amazing penis into your life. The David will bring a smile into your heart on days when you get splashed by a bus and everyone at the bank was rude to you and you accidentally got a grande decaf. The world's not such a terrible place after all, is it?
Defining Characteristics : Enough girth and length that it could feasibly be used in place of a rolling pin, doorstop, or medium-sized paperweight.
Most Common Reaction : "Is this a prank? Are you filming me?" Most Often Found Attached To : A guy who acts like it is totally normal to ask you to shove this monster into one of your orifices, like you're about to play some kind of sexual version of Chubby Bunny . How It Will Enrich Your Life : People talk a big game about huge dicks. Oh, "the bigger the better" this! Oh, "size of a Chipotle burrito" that! Well, a few hours with the Kraken will help you make up your own mind. Put your money where your vag is! Do you believe the big dick hype? Or does the prospect of trying to shove this fleshy bowling pin into a hole remind you of some kind of unsolvable high school math equation? Either way, now you know!
Defining Characteristics : A mole, a growth, a weird thing that looks like a cut, but maybe it could be a birth mark and I'm just being paranoid?
Most Common Reaction : "That can't be a ... I mean, should I stop and ask? No, that would be rude ... but ... is that really supposed to be there? Oh my god, did that mole just move?!"
Most Often Found Attached To : Anyone! Double-Takes are hiding in the pants of all your friends and neighbors, people. Stay ever-vigilant! How It Will Enrich Your Life : Dealing with a Double-Take helps you break the ice on one of the most difficult sexual tasks in the world: Asking an awkward question about your new partner's genitals. Yes, yes, I know. It is unilaterally awful. But it is also necessary to protect your sexual health. Maybe that thing that looks like an open sore is actual just a smudge of spilled Nutella. But you need to ask. Riding a Double-Take and not asking is also a lesson in how important it is to ask your partner. Because if you don't ask about that weird bump, you'll spend the following weeks obsessively Google Image searching "genital warts" — which, trust me, is 10,000 times worse than 30 awkward seconds discussing a skin tag.
Defining Characteristics: The ability to grow massively in size in seconds, like those little pellets they used to make that would turn into big foam dinosaurs after you dropped them in water.
Most Common Reaction : "Oh ... great!"
Most Often Found Attached To : Someone who is really opposed to letting you take off his pants until he is fully erect. How It Will Enrich Your Life : The Grower doesn't teach any specific life lesson. He's just a classic early adulthood experience — like decorating your first apartment, or watching a friend get married for the first time. You are now part of the coven of Fully Sexual Adulthood! We'll have to get you a commemorative plaque.
Defining Characteristics : The ability to give consistent vaginal orgasms to everyone who comes near it.
Most Common Reaction : "OooooooooOOOOOOOOoooooooOOOOOOOoooooooooo!"
Most Often Found Attached To : Two AA batteries. How It Will Enrich Your Life : Like the Loch Ness Monster, the Vaginal Orgasm-Giver is probably a beautiful myth. But, also like the Loch Ness Monster, some of us still hold out a shred of hope. Because wouldn't it just be so cool if it was real? The odds are against it, and it's foolish to build your life around hoping to see one. But keeping your eyes peeled can't hurt, right? And, like the Loch Ness Monster, if you have any compelling footage proving that this creature is real, you have a solemn duty to create a SyFy channel special about it. But also, if you've actually found one of these, what the hell are you doing sitting around reading about dicks on the Internet, you maniac?!
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