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Concealed ovulation or hidden estrus is the lack of any perceptible change (e.g., a change in appearance or scent) when an adult female is fertile and near ovulation.Some examples of perceptible changes are swelling and redness of the vulva in baboons and bonobos, and pheromone release in the feline family.
Additionally, they do not show obvious physical signals of high fertility. This has led many researchers to conclude that humans lost their estrus through evolution. [11] [page needed] It has been hypothesized that this could be due to the adaptive benefits of concealed ovulation and extended sexuality. [12] [page needed] [13] [page needed]
This is achieved through concealed ovulation in most animals that exhibit extended female sexuality. [19] A review of studies revealed that, in humans, females only exhibit subtle changes during estrus, making it difficult for males to assess fertility with precision. [20]
Several explanations have been proposed to explain concealed ovulation in humans. Females near ovulation experience changes in the cervical mucus , and in basal body temperature . Furthermore, many females experience secondary fertility signs including Mittelschmerz (pain associated with ovulation) and a heightened sense of smell , and can ...
Human couples do not live in an exclusive territory (like gibbons); they live embedded in society and cooperate with other couples economically. Marriage partners usually have sex in private, unlike most animals. Human ovulation is concealed. Therefore, most human sex is recreational rather than for reproduction.
Humans, unlike most other species, have concealed ovulation, a lack of obvious external signs to signal estral receptivity at ovulation (i.e., the ability to become pregnant). Some species of animals with estrous cycles have unmistakable outward displays of receptivity, ranging from engorged and colorful genitals to behavioral changes like ...
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Research on concealed ovulation in humans: Scientific career: Fields: Evolutionary psychology: Institutions: University of New Mexico: Thesis: On the etiology of individual differences in self-monitoring and expressive self-control: Testing the case of strong genetic influence (1986)
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