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Medicine Earth Science

Lack of Penis Bone In Humans Linked To Monogamous Relationships and Quick Sex, Study Says (theguardian.com) 279

The penis bone can be as long as a finger in a monkey and two feet long in a walrus, but the human male has lost it completely. According to a new report published in Proceedings of the Royal Society, the lack of a penis bone in human males may be a consequence of monogamy and quick sex. The Guardian reports: Known as the baculum to scientists with an interest, the penis bone is a marvel of evolution. It pops up in mammals and primates around the world, but varies so much in terms of length and whether it is present at all, that it is described as the most diverse bone ever to exist. Prompted by the extraordinary differences in penis bone length found in the animal kingdom, scientists set out to reconstruct the evolutionary story of the baculum, by tracing its appearance in mammals and primates throughout history. They found that the penis bone evolved in mammals more than 95 million years ago and was present in the first primates that emerged about 50 million years ago. From that moment on, the baculum became larger in some animals and smaller in others. Kit Opie who ran the study with Matilda Brindle at University College London, said that penis bone length was longer in males that engaged in what he called "prolonged intromission." In plain English, that means that the act of penetration lasts for more than three minutes, a strategy that helps the male impregnate the female while keeping her away from competing males. The penis bone, which attaches at the tip of the penis rather than the base, provides structural support for male animals that engage in prolonged intromission. Humans may have lost their penis bones when monogamy emerged as the dominant reproductive strategy during the time of Homo erectus about 1.9 million years ago, the scientists believe. In monogamous relationships, the male does not need to spend a long time penetrating the female, because she is not likely to be leapt upon by other amorous males. That, at least, is the theory.
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Lack of Penis Bone In Humans Linked To Monogamous Relationships and Quick Sex, Study Says

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  • by DeathToBill ( 601486 ) on Thursday December 15, 2016 @05:22AM (#53488723) Journal

    "Scientists are crap in bed: official."

    Certainly lines up with my experience.

  • Eh... (Score:4, Interesting)

    by EmeraldBot ( 3513925 ) on Thursday December 15, 2016 @05:24AM (#53488739)

    I'm not so sure I agree. I can't say I have accurate statistics off the top of my head, but I have a hard time believing the majority of people copulate for less than 3 minutes a session. Furthermore, the whole group thing is also improbable - in many tribal cultures, people traditionally engaged together, and even in monogamous societies, humans have sex together an awful lot more than we like to admit.

    It probably has more to do with intelligence and social communication, to be honest. The point of it is to help keep your appendage in place, and while I already think it's unlikely it really works that well in humans, it'd have virtually no use if both partners consistently agreed before hand. That's the say, the best use it has is when your partner is trying to get away from you - which probably declined quite a bit as people started to live in larger tribes and developed speech, and thus could decide when they did and didn't want to have sex. Combine that with increasing disapproval of rape, and I think sex simply evolved into more of a cooperative activity for people, and thus a (literal) boner was simply not useful anymore. Imagine if people only ever had each other for 2 minutes a session, from start to finish, how miserable that would be...

    • by swb ( 14022 )

      Kinsey said 75% of men only lasted two minutes, and more recent results suggest half only last two minutes, with the average something like 7 minutes. Older (and perhaps less reliable) research suggested no correlation with perceived orgasm quality and duration of intercourse. Both sexes claim that they want intercourse to last longer, but men want it to last longer than women.

      It doesn't surprise me that the duration for a large number of men is short. Men's primary biological goal with intercourse is to

  • And without this bone, the standard is much shorter? Fascinating.

  • by dargaud ( 518470 ) <slashdot2@gd a r gaud.net> on Thursday December 15, 2016 @05:46AM (#53488793) Homepage
    Their dates seem off. I thought that monogamy in humans had emerged with agriculture: once you own a plot of land and invested lots of work into it, you pretty much want to limit access to it (and its production), so that means only to your kids, and to be sure the kids are yours you pretty much have to be monogamous. See all the still existing tribes of hunter gatherers that practice polygamy.
    • by Dog-Cow ( 21281 )

      Polygamy does not have to mean that the females have multiple male partners, and usually doesn't. It doesn't matter how many female partners a male has. He will be just as (un)sure of the parentage.

    • by silentcoder ( 1241496 ) on Thursday December 15, 2016 @06:52AM (#53488959)

      > once you own a plot of land and invested lots of work into it, you pretty much want to limit access to it (and its production),

      Aaah the gold old flaws of using projection and 'common sense' to try and know things. There is documented proof that this is not true. It's not even obscure science - it's a book from that era that is still found in every hotel room in America !

      *If a man walks over your field he is permitted to leave with all the food he can carry in his stomach.
      *The final harvest of the season may not be gathered, it must be left in the field for the widows and the orphans.
      * When you gather the harvest from your fields, do not gather from the edges of your fields. Do not gather the *gleanings of your harvest.
      * Do not gather *grapes from your *vineyard a second time. Do not pick up the *grapes that fell (to the ground). Leave them for poor people (to gather) and for foreigners (to gather). I am the *LORD (who is) your God.

      Those are from the book of Leviticus, part of the mosaic code - one of the oldest set of societal laws of which we have a record. This is thousands of years*after* the invention of agriculture and, and this is important, still several thousand BEFORE the invention of monogamy (which was not invented until the 3rd century AD and even after that remained limited to only one religion for several more centuries).

      There is no evidence that monogamy and agriculture is in any way link, and all the evidence we do have suggests that your idea of restricting access to the results of agriculture was utterly rejected (and indeed made illegal) in ancient societies.
      You can think of those verses as the Biblical era version of the modern welfare state.

      This is also not unique to the Judeo-Christian history - I merely used that because it's well-known but you found similar rules and setups in the Aztec and Inca societies as well. Indeed, everywherre we have written records or other evidence to learn from - we find that agriculture was always a collective process which involved large sections of society and was shared quite freely within that society. The Inca version for example had no concept of money - they traded labour. If I wanted some of your pumpkins you would freely give them to me, and I would promise you a favour at some future date - perhaps helping you plow the field for your next batch of pumpkins.

  • the act of penetration lasts for more than three minutes

    By that logic, all men should still have their bones. Cause, if you're lasting less than three minutes with the same woman for how many years I am so very sorry.

  • That's why I get boners all the time. Oh, wait...

  • by hyades1 ( 1149581 ) <hyades1@hotmail.com> on Thursday December 15, 2016 @06:34AM (#53488905)

    ...B-b-b-b-bad to the bone

  • Don't think so. (Score:5, Insightful)

    by Qbertino ( 265505 ) <moiraNO@SPAMmodparlor.com> on Thursday December 15, 2016 @06:53AM (#53488965)

    I think it's a different selector.

    Think about the biggest 'disadvantage' of having a squishy penis: Men under stress don't get a hard-on and thus can't reproduce. This could've emphasized and benefited populations with lesser stress and more room to develop higher skillsets to surpass a potential human branch with real boner.

    It could also be for 'economic' reasons. Humans are built and optimised towards long-distance running. No other animal can sweat like we do. A bushman (or any other non-obese halfway trained human) can run an antelope to 'death by bodyheat and/or exhaustion'. That is a pretty awesome raw survival skill innate to homo sapiens. I suspect lugging a bone penis dangling between your awesome running legs might actually be quite cumbersome - since it's mostly men doing the running and the ladies nourishing big-headed babies (that need special attendance and culture as extended brain + serious actual brain nutrition) after laboriously squeezing them out of a notably narrow birth canal.

    Also we only need our penis once in a while. Having a lightweight retractable one is generally quite practical from an evolutionary perspective. Also I suspect the squishiness prevents injuries and infections better than a true boner would. Wales float. They don't have to worry about their boner bumping and scraping on the ground or on rocks.

    Bottom line:
    You needn't go to far to get a handle on what's up with the squishy penis - the answer is probably quite simple.

    • by Applehu Akbar ( 2968043 ) on Thursday December 15, 2016 @08:33AM (#53489287)

      "Think about the biggest 'disadvantage' of having a squishy penis: Men under stress don't get a hard-on and thus can't reproduce. This could've emphasized and benefited populations with lesser stress and more room to develop higher skillsets to surpass a potential human branch with real boner."

      You, ahem, nailed, a possible reason for 'idiocracy' in the long run: husbands with demanding, high-stress jobs getting outcompeted in the bedroom by the lackadaisical pool guy or barista.

    • No other animal can sweat like we do

      Horses can sweat pretty seriously, too.

      Sweating works quite well for us because we don't have significant body hair. Most animals have a fur coat, sweating is for them a very bad idea. It would be interesting to know whether we lost our hair first, or started to sweat first. I expect the first.

      There are anyway not that many mammals other than us without fur, and the few that are naked like to live in or near the water, like water buffalo, rhinos and whales.

    • by judoguy ( 534886 )

      Also we only need our penis once in a while. Having a lightweight retractable one is generally quite practical from an evolutionary perspective. Also I suspect the squishiness prevents injuries and infections better than a true boner would. Wales float. They don't have to worry about their boner bumping and scraping on the ground or on rocks.

      I agree. We fight as a species and it's simply easier to fight without an erection that can risk harm to the "pass along my genes" organ.

      You want one when you want one and any other time an erection is a liability.

      The phrase "gird your loins" came about for a reason.

    • Think about the biggest 'disadvantage' of having a squishy penis: Men under stress don't get a hard-on and thus can't reproduce.

      Except this isn't actually true. First, stress is unevenly distributed among populations, so this only changes who is most able to reproduce. Second, it only takes one male to impregnate a whole bunch of females, so it only takes a subset of individuals who can maintain an erection during stress to keep up the birth rate. Third, there are plenty of males who can maintain an erection during stress, especially for the two minutes it apparently takes to do the deed. Indeed, there are significant numbers of mal

  • The explanation given explain why it would not be selected FOR, but it does not explain why it would be selected against. My biology knowledge may be rusty, but IIRC to have something disappear like that, you need to have it selected against.
    • Not really... absence of positive pressure is why cave animals don't have functional eyes. Of course, eyes are relatively complicated so it is comparatively easy for them to end up 'breaking' compared to something simple like a baculum. The more unusual thing is that, to me anyway, their hypothesis seems like a relatively weak pressure and with something this directly involved in reproduction, the selective pressure would be somewhat stronger.
    • by arth1 ( 260657 )

      The explanation given explain why it would not be selected FOR, but it does not explain why it would be selected against. My biology knowledge may be rusty, but IIRC to have something disappear like that, you need to have it selected against.

      Two sides of the same coin. If your gene mutation X gives your descendants an advantage, it also gives your descendants' competitors a disadvantage. A main part of evolution is competition; a warfare against your own species.

      Also, if the difference of a mutation is small enough that the advantage or disadvantage is negligible, the genes can survive in some and not in others. Over a large time scale, it can then be random which "neutral" alleles survive and which disappear.

      Remember that evolution does no

  • Every tabloid web site picked up and ran with this story. What's it doing on /.? It's click-bait garbage.

  • It pops up in mammals and primates around the world.

    I see what they did there.

  • Let's all remember, evolution is largely driven by women's choices in reproduction.

  • "penis bone length was longer in males that engaged in what he called "prolonged intromission.""

    Humans have selected for monogamy with a higher level of sexual enjoyment than any other species because of our extremely long maturation time, with its need to keep couples together for the twenty years it takes to bring offspring to maturity. If a baculum were to help with this, we would still have one.

  • Just kidding. Not so much.

    Personally, I think we evolved without it when we took to walking upright. A penis bone would have kept all male penises pointing up at the angle of optimum intromission. This would have forced all males to urinate in long rainbow arcs that got piss all over the place in a highly conspicuous way and would have made the penis, sticking out and up right up front, highly vulnerable to all sorts of weapons as tribal man fought one another. Hard to tuck the junk back and out of risk

  • My bet goes to pants. A bone would make wearing pants so very uncomfortable.

  • by p51d007 ( 656414 ) on Thursday December 15, 2016 @10:10AM (#53489819)
    When the "man bun", skinny jeans, man makeup and other crap came around.
  • If you are playing the other team. impregnating is probably not your top priority?

  • We have a new candidate.

"If there isn't a population problem, why is the government putting cancer in the cigarettes?" -- the elder Steptoe, c. 1970

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