Recently, the genital licking of Pteropodid bats has attracted great attention as this group of bats offers a new functional explanation for the behavior. In spotted hyenas, Crocuta crocuta, individuals of both sexes lick or sniff a male's erect penis and a female's erect pseudo-penis as a greeting ceremony in relation to social rank. Juvenile male bonobos, Pan panicus, frequently fellate other juvenile males in the context of play. Tibetan macaque Macaca thibetana, males living in crowded male groups engaged in penis sucking of other males, which functioned as greeting and in reducing the tension between two males. Such same-sex fellatio is considered non-reproductive sexual behavior. However, fellatio has been observed in other mammals between females and males, as well as same-sex individuals, both in captivity and in the wild. Homosexual fellatio in this species could help males solve inconsistent situations in the roost when there are conflicts between cooperative behavior for social thermoregulation and competition for mating.įellatio, the genital contact behavior by mouth of individuals on a male’s erect penis is widely used as foreplay during human copulation. Given that neither the simpler alternative that in all male groups such fellatio may represent misdirected sexual behavior, nor the two previously proposed functional hypotheses were supported by the data, I propose another functional hypothesis. As such, male-male fellatio can be considered as homosexual behavior, two functional explanations could account for this behavior the social bonding and the social tension regulation hypotheses suggested in a previous review. Unassociated with allogrooming, same-sex genital licking occurred among males in the all male clusters. The female clusters may also contain a few males.
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During the mating season, adult flying foxes roost in same-sex groups, forming ball-shaped clusters which provide warmth. In the present paper, a form of fellatio in wild Bonin flying foxes, Pteropus pselaphon, performed between adult males has been reported.
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A recent focus of interest has been on the functional significance of genital licking (fellatio and cunnilingus) in relation to sexual selection in Pteropodid bats.