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In one reported observation, a male spotted hyena attempted to mate with a female hyena , but she succeeded in driving him off. Homosexual behaviour does occur in the animal kingdom outside humans, especially in social species, particularly in marine birds and mammals, monkeys, and the great apes. Retrieved on 15 February As of , the scientific literature contained reports of homosexual behavior in at least wild species. While the females do this, the penis is not withdrawn and research has shown a positive relationship between length of the time that the penis is licked and the duration of copulation.

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Recent studies using positron emission tomography PET and magnetic resonance imaging MRI has provided evidence proving that chemical changes that occur with emotions are similar between humans and non-human animals.

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Great varieties of non-copulatory mounting are expressed in several species. Perhaps the bonobo's most typical sexual pattern, undocumented in any other primate, is genito-genital rubbing or GG rubbing between adult females. Because animals possess a brain reward system they are motivated to perform in different ways by desire and reinforced by pleasure. Genital-genital rubbing , or GG rubbing, among non-human animals is sexual activity in which one animal rubs his or her genitals against the genitals of another animal.

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