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You can view the lecture here. At about the 11:40 point the claim is made that humans are the only species that engage in non-reproductive sex.

Is there solid evidence for or against the idea that only humans have non-reproductive sex? (oh and it's a fun lecture)

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    For Bonobos sex is more than just for reproduction. – Oliver_C Jun 8 '11 at 20:47
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    Not exactly scholarly, but there are videos on youtube of a Chimpanzee using a Bullfrog as a masturbatory aid. – user3434 Jun 8 '11 at 20:56
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    I've heard this about many species, including aforementioned Bonobos, Dolphins and more. Also homosexual behavior in animals is rather widespread, and I'll be damned if that's a reproductive sex. – user288 Jun 8 '11 at 21:28
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    My dog has this type of sex with my leg most days! – user2466 Jun 8 '11 at 22:46
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    The answer kinda depends on what you mean exactly. Animals have sex because they're horny (that's just how nature works for all animal species), and with normal male-female sex there is a chance that the female gets pregnant. So you could say that no animals have sex because they want to reproduce, but because that happens once they do it. They don't realize the difference between the fun and pregnancy parts of having sex. Kit Sunde above me has an interesting answer, although i doubt that's what you meant. – poepje Jun 9 '11 at 11:37
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Bonobos are an example.

From Discovering Animal Behaviour:

Sex is key to the social life of the Bonobo.
They largely use sex as a means to alleviate conflicts or resolve them.

When ill feelings begin to form between Bonobos– everything stemming from territorial issues to competition for food– their first reaction is to smooth it over with sexual contact.


From Bonobo.org:

Bonobos seem to ascribe to the 1960s hippie credo, "make love, not war." They make a lot of love, and do so in every conceivable fashion.

Sex in bonobo society transcends reproduction, as it does in humans. It serves as a way of bonding, exchanging energy and sharing pleasure.


More Sources:

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    Also, Bonobos are probably the species most close to humans as indicated by genetic sameness. – Thorbjørn Ravn Andersen Jun 9 '11 at 10:45
  • I read once that this behaviour was not concretely proven to be normal, but I don't have the link handy :(. Dolphins are a more concrete example though. – RolandiXor Jun 9 '11 at 21:23
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Bonobos are a prime example of sex for the sake of sex. Also Capuchins. Anyone who has watched the Discovery Channel enough knows about this behavior.
Do it like on the discovery channel

I am quite surprised that the lecturer would make such a blatantly wrong statement. Bonobos have their own domain that even states:

Sex permeates the fabric of bonobo society, weaving through all aspects of daily life. It serves an important function in keeping the society together, maintaining peaceful, cooperative relations. Besides heterosexual contact, both male and female bonobos engage in same-sex encounters, and even group sex occurs.

For a scholarly paper (with abstract quoted below), I suggest: Nonconceptive Sexual Behavior in Bonobos and Capuchins

Sexual behavior by infecundable females, and by same-sex and adult-immature dyads, occurs in wild and captive bonobos (Pan paniscus). Proposed functions of these behaviors, in social primates generally, include practice, paternity confusion, exchange, and communication as well as appeasement. We used this framework to interpret and to compare observations of sexual behavior in a captive bonobo group and a wild white-faced capuchin (Cebus capucinus) group. In both species, (a) sexual behavior was no more frequent in cycling females than in pregnant or lactating females and (b) same-sex and adult-immature dyads engaged in as much mounting or genitogenital contact as adult heterosexual dyads did. The species differed in that (a) bonobos engaged in sexual behavior 65 times as frequently as capuchins, (b) only bonobos engaged in sexual contact other than ventrodorsal mounting during focal observation, and (c) bonobo sexual contact was concentrated most heavily in socially tense situations in adult female–female dyads, whereas capuchin sexual contact was concentrated most heavily in socially tense situations in adult male–male dyads. These data and published literature indicate that (a) practice sex occurs in both species, (b) paternity confusion may be a current function of C. capucinus nonconceptive sex, (c) exchange sex remains undemonstrated in capuchins, and (d) communication sex is more important to members of the transferring sex—female bonobos and male capuchins—than to members of the philopatric sex.

Monkey Sex/porn

I would treat ANY statement made to make humans appear truly unique in the animal kingdom with a great deal of skepticism. We are after all only animals after all (only marginally more clever than others).

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    Geez, do you have to include the dirty picture? :P – Kyralessa Jun 8 '11 at 22:24
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    I wanted to upvote this right up until that last picture.... – Russell Steen Jun 8 '11 at 22:30
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    @Russell Steen What's wrong with a little monkey porn? They read this site too you know! ;) – Larian LeQuella Jun 9 '11 at 1:53
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    Capuchins have even been known to engage in prostitution. Interesting side effect of teaching them to use money. – user2514 Jun 9 '11 at 3:56
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    @DJClayworth Not sure how you get my warning to treat statements about human uniqueness with skepticism as a dismissal based on preconceptions. If anything, too many people view humans as separate from nature, and they have preconceptions that need to be overcome. – Larian LeQuella Nov 30 '16 at 17:54
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As one example, bottlenose dolphins routinely engage in non-reproductive intercourse - this can be when females are not in estrus (I can't locate the reference though), and there is also a lot of non-intercourse sexual behaviour between individuals, even between males (Mann, J. 2006. Sociosexual behaviour among Indian Ocean bottle-nose dolphins and the development of male-male bonds.

In: Homosexual Behaviour in Animals: an Evolutionary Perspective (Ed. by P. Vasey & V. Sommer), pp. 107-130. Cambridge: Cambridge University Press).

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    I'm not going to research it now, because I'm in work, but I believe bottlenose dolphins make use of their blowholes, making them the only species known to engage in nasal sex. – TRiG Jun 9 '11 at 9:54
  • the male-male bonds are not sexual, those are the same common male-male bonds that are common in intelligent species (like chimps) where males simply form groups. – RolandiXor Jun 9 '11 at 21:25
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    @TRiG Is that a polite way of saying "I will not Google dolphin blowhole sex right now because my boss might see it in my history." – IQAndreas Apr 25 '15 at 8:39
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    @IQAndreas Yup. That's precisely what it means. – TRiG Apr 25 '15 at 10:51
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Mallard ducks are reported to both attempt to rape ducks of the same sex, as well as practice necrophilia. Either of those should qualify on some level as non-reproductive sex, even if not consensual for the one in a pickle. This discovery earned Kees Moeliker the Ig Nobel prize in 2003. The guardian reports:

Ducks behave pretty badly, it seems. It is not so much that up to one in 10 of mallard couples are homosexual - no one would raise an eyebrow in the liberal Netherlands - but they regularly indulge in "attempted rape flights" when they pursue other ducks with a view to forcible mating. "Rape is a normal reproductive strategy in mallards," explains Mr Moeliker

Mr Moeliker suggests the pair were engaged in a rape flight attempt. "When one died the other one just went for it and didn't get any negative feedback - well, didn't get any feedback," he said.

The whole article is a great read.

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    Well, of course ducks are evil. When the Great Flood came, they just swam. Fish are evil too. And dolphins. – Kit Z. Fox Jun 9 '11 at 14:23
  • @kit - I like your name. – Kit Sunde Jun 9 '11 at 14:56
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    Should we add that dogs are sometimes gay? – user4951 Nov 14 '11 at 8:09
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    @JimThio - If it has references, yes. Also anecdotally; I once owned a very inscestous cat that made his minutes younger and smaller brothers life rather miserable regardless of plenty of negative reinforcement from his owners. – Kit Sunde Nov 14 '11 at 9:38
  • You're kind of verging on mounting behavior, which is certainly very different than sex/mating. – fredsbend Nov 30 '16 at 17:55

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