Short-nosed flies show unusual behavior during mating.
Not only humans but also fruit bats practice oral sex. But while in humans, the pleasure gain comes first, use the short-nosed flies of the species Cynopterus sphinx fellatio obviously to improve their chances of reproduction. A Chinese-British research team has found this out in studies of the copulation behavior of the animals. The female fruit bats stimulated therefore during the mating process, the penis of the male additionally with her tongue. Every second oral stimulation increased sexual intercourse by six seconds, which could improve fertilization success, scientists at Min Tan, Guangdong Entomological Institute, Guangzhou, suspect. Oral sex is almost unknown in the animal kingdom, only young dwarf chimpanzees have been observed so far, with scientists interpreted their behavior as a play instinct. In humans, though, fellatio is widespread, but researchers see no evolutionary advantage in this practice. For short nose flight dogs, this could be different. The Min Tan scientists support their theory above all by the fact that in twenty pairings observed, fourteen, or around 75 percent, of the female animals orally stimulated their male partners. For this purpose, the females leaned far forward during copulation and licked the penis for a few seconds. The more often and longer they did, the longer the mating took.

The unusual mating behavior could bring several benefits, the scientists believe. First, the saliva could simply act as a kind of lubricant and facilitate mating. On the other hand, it is conceivable that the additional stimulation prolongs the excitement and thus the duration of erection. This in turn could increase the chance of successful fertilization, which ultimately benefits both animals.

Perhaps the females influence the binding behavior of the males through extensive copulation. Fruit bats usually live in separate groups of male or female animals and only come together at mating season. A male then mates diverse females. Whether this constellation is influenced by the mating behavior, but still needs further investigation, explain the researchers. According to another theory, oral sex would, however, primarily benefit men's bats: the disinfecting action of saliva could prevent the transmission of disease. According to the researchers, this theory is supported by the fact that the males lick their genital area once again after the sexual intercourse.

Min Tan (Entomological Institute, Guangzhou) et al .: Plos One, doi: 10.1371 / journal.pone.0007595 The behavior of the animals also shows a video taken by the researchers >> ddp / science.de? Mascha Schacht advertisement

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