The cooperative sex : Sexual interactions among female bonobos are linked to increases in oxytocin, proximity and coalitions

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2019
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Moscovice, Liza R.
Surbeck, Martin
Hohmann, Gottfried
Jaeggi, Adrian V.
Deschner, Tobias
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Hormones and Behavior. Elsevier. 2019, 116, 104581. ISSN 0018-506X. eISSN 1095-6867. Available under: doi: 10.1016/j.yhbeh.2019.104581
Zusammenfassung

In some species habitual same-sex sexual behavior co-occurs with high levels of intra-sexual alliance formation, suggesting that these behaviors may be linked. We tested for such a link by comparing behavioral and physiological outcomes of sex with unrelated same- and opposite-sex partners in female bonobos (Pan paniscus). We analyzed behavioral outcomes following 971 sexual events involving n = 19 female and n = 8 male adult and sub-adult members of a wild, habituated bonobo community. We additionally collected n = 143 urine samples before and after sexual interactions to non-invasively measure oxytocin (OT), which modulates female sexual behavior and facilitates cooperation in other species. The majority of sexual events (65%) consisted of female same-sex genito-genital rubbing (or GG-rubbing). Female dyads engaged in significantly more sexual interactions than did inter-sexual dyads, and females were more likely to remain within close proximity to their partners following GG-rubbing. Females also exhibited greater increases in urinary OT following GG-rubbing compared with copulations, indicating a physiological basis for increased motivation to cooperate among females. The frequency of coalitionary support among non-kin was positively predicted by the frequency of sexual interactions for female as well opposite-sex dyads, although coalitionary support tended to be more frequent among females. The emergence of habitual same-sex sexual behavior may have been an important step in the evolution of cooperation outside of kinship and pair-bonds in one of our closest phylogenetic relatives.

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Fachgebiet (DDC)
570 Biowissenschaften, Biologie
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Pan paniscus, Socio-sexual behavior, Copulations, Genito-genital rubbing, Oxytocin
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ISO 690MOSCOVICE, Liza R., Martin SURBECK, Barbara FRUTH, Gottfried HOHMANN, Adrian V. JAEGGI, Tobias DESCHNER, 2019. The cooperative sex : Sexual interactions among female bonobos are linked to increases in oxytocin, proximity and coalitions. In: Hormones and Behavior. Elsevier. 2019, 116, 104581. ISSN 0018-506X. eISSN 1095-6867. Available under: doi: 10.1016/j.yhbeh.2019.104581
BibTex
@article{Moscovice2019coope-57199,
  year={2019},
  doi={10.1016/j.yhbeh.2019.104581},
  title={The cooperative sex : Sexual interactions among female bonobos are linked to increases in oxytocin, proximity and coalitions},
  volume={116},
  issn={0018-506X},
  journal={Hormones and Behavior},
  author={Moscovice, Liza R. and Surbeck, Martin and Fruth, Barbara and Hohmann, Gottfried and Jaeggi, Adrian V. and Deschner, Tobias},
  note={Article Number: 104581}
}
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