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Same-sex behaviour among wild female gorillas has been documented for the first time and the Australian behind the study believes it is motivated by sexual arousal. Associate Professor Dr Cyril Grueter, a primate expert from the University of Western Australia, stumbled on the behaviour when studying the feeding ecology of mountain gorillas in Rwanda,. This is the first time two wild female gorillas have been documented engaging in sexual behaviour. Credit: University of Western Australia. It was after a miserable period of rain in the jungle and female gorillas enjoying the sunshine were trying to court the male but, Dr Grueter said, he had no interest in them. Working with the Dian Fossey Gorilla Fund International while on an month field trip in , Dr Grueter turned his attention to studying what was behind this behaviour.
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Australian scientist spots girl gorillas in the midst of same-sex passion

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Gorillas documented having lesbian sex for the first time | The Independent

Human females, unlike most mammals, are sexually active outside of fertile periods. This decoupling of sexual behavior from its conceptive function has had an enormous impact on human social relationships, and yet we know little about why there was selection for nonconceptive mating. Here we examine one form of nonconceptive mating, the mating that occurs during pregnancy or post-conceptive PC mating, in wild western gorillas Gorilla gorilla. Using a near complete mating record for five females during gestation, we show that pregnant females varied in the timing and frequency of mating, and used PC mating conditionally, synchronizing copulations to occur on days when other females mated, and refraining from mating for lengthy periods when no other females mated.
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Gorilla sexual intrigue could explain human monogamy

Female gorillas have been documented engaging in lesbian sex for the first time. While many species of male primates are well known to engage in homosexual behaviour, females have been subject to far less attention. Female gorillas have also been observed having lesbian sex in Uganda, but the data has not been published or subject to scrutiny.
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As part of a study facilitated through the Dian Fossey Gorilla Fund International, a researcher from The University of Western Australia has documented the first detailed evidence of homosexual behaviour in female gorillas. While bonobos are renowned for their rich sexual repertoire which includes homosexual acts, much less is known about the homosexual behaviour of other Great Apes. Associate Professor Cyril Grueter from UWA's School of Anatomy, Physiology and Human Biology was conducting a study on the feeding ecology of mountain gorillas in Rwanda when he observed homosexual behaviour in some of the females leading him to delve deeper. Of the 22 female gorillas studied, 18 were found to engage in homosexual activity such as frottage.
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