Copulatory calls in primates serve an adaptive function and are sexually selected. There are many different hypotheses as to the exact adaptive function of female copulatory calls in primates and research on the subject is still in its early stages. Red junglefowls , for instance, utilize calls in order to prevent or end unwanted copulations by attracting another high-ranking male fowl. The vocalizations of female elephants are also used in order to incite mate guarding behavior in the male,  which manifests itself in the form of fighting off any newly arriving mates. In regard to the calling properties, frequency analysis is typically used in research to look at the complexity of the vocalization and to distinguish between calls, which is important in determining their function. Female crickets which mate with multiple partners receive a greater number of nuptial gifts ,  causing them to lay a larger quantity of eggs, hence increasing their reproductive success. In other words, copulatory vocalizations address issues that stand in the way of successfully producing offspring and guaranteeing its survival, such as the occurrence of infanticide.
In contrast, the percentage for chimpanzees and Tonkean macaques has been found to be There is no mutual exclusivity when it comes to addressing the two problems described, namely that of infanticide and receiving high quality sperm. Not only females make use of this, as male Columbian ground squirrels have been observed to use copulatory vocalizations in order to announce their post-copulatory mate guarding to others. Female crickets which mate with multiple partners receive a greater number of nuptial gifts ,  causing them to lay a larger quantity of eggs, hence increasing their reproductive success. In regard to the calling properties, frequency analysis is typically used in research to look at the complexity of the vocalization and to distinguish between calls, which is important in determining their function. Accordingly, some species produce calls that are structurally more complex than that of others. The vocalizations of female elephants are also used in order to incite mate guarding behavior in the male,  which manifests itself in the form of fighting off any newly arriving mates. One study found that women who perceived a high risk of infidelity in their relationship were more likely to utilize copulatory vocalizations in order to fake an orgasm , along with other mate retention behaviours. They serve as a means to advertise sexual receptivity and are predominantly used by males to attract female mates. Reasons for wanting to boost the male self-esteem included reinforcing the pair bond that intercourse helps to strengthen, and thus reducing emotional and sexual infidelity and abandonment. This 'parental concentration',  has two outcomes. Red junglefowls , for instance, utilize calls in order to prevent or end unwanted copulations by attracting another high-ranking male fowl. Vocalizations that are made prior to copulation are named mating calls. One study, for instance, has noted that female sexual vocalizations tend to become more intense as she approaches orgasm ; at orgasm her vocalization tends to become very rapid, with a regular rhythm that includes equal note lengths and intervals between notes, which male vocalization typically lacks. Both men and women can experience hyperventilation during sexual arousal,  which can involve involuntary vocalizations. Copulatory calls in primates serve an adaptive function and are sexually selected. Firstly, the male might be of high quality , allowing him to fend off those that were attracted by the call. There are many different hypotheses as to the exact adaptive function of female copulatory calls in primates and research on the subject is still in its early stages. The calls produced by the female also carries information about the status of the male with whom she was copulating, thus allowing her to influence the likelihood of other males approaching. The strategy to mate with multiple partners in order to obtain material benefits can equally be observed in non-primates. Secondly, if the male fails to successfully guard her, she will mate with the newly arrived males, hence inciting sperm competition and paternity confusion again preventing attacks on her offspring , as well as increasing her likelihood of obtaining high quality sperm. In non-human primates[ edit ] Occurrence, frequency and form[ edit ] Sonograms of female copulatory vocalizations of a human female top , female baboon middle , and female gibbon bottom ,  with time being plotted on the x-axis and the pitch being represented on the y-axis. In non-human primates, copulatory vocalizations begin towards the end of the copulatory act or even after copulation. Alternative benefits[ edit ] In addition to the incitement of parental confusion in order to avoid infanticide , female primates that exhibit promiscuous behavior also reap non-genetic material benefits. However, by taking the female's cycle stage into account, sperm competition can be ruled out as the primary underlying cause of copulatory calling. The resulting uncertainty of who the father is hence reduces the occurrence of attacks, given the newly incited risk of potentially harming their own offspring.
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