According to the Guttmacher Institute, there is considerable evidence that links an increase in conceptive use with a decline in unintended pregnancy and subsequent abortion.
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Some female primates, like in the White-fronted capuchin (C. albifrons), will mate will subordinate males while they are no longer conceptive in order to decrease the amount of resource competition and increase the amount of male protection for her offspring.
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This hypothesis has received much criticism. For example, as all mammals experience the same immune system responses to sperm antigens, this hypothesis predicts that all mammals should exhibit extended female sexuality. However, only few species of mammals exhibit sexual behaviour outside the conceptive period.
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None of Philo's works are extant; our knowledge of his views is derived from Numenius, Sextus Empiricus and Cicero. In general, his philosophy was a reaction against the Academic skepticism of the Middle and New Academy in favor of the dogmatism of Plato. He maintained that by means of conceptive notions (katalêptikê phantasia) objects could not be comprehended (akatalêpta), but were comprehensible according to their nature.Sextus Empiricus, Hypotyp. i.
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Alpha males are more fit, and therefore more likely, to provide direct and indirect benefits to the female compared to other subordinate males. In the White-faced capuchin (C. capucinus) the alpha male fathers 70-90% of the offspring produced by females in his group. It is hypothesized that females are mating with alpha males while they are ovulating and then mating with subordinate males after they are no longer conceptive.
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Firstly, in species that demonstrate extended female sexuality, there should be evidence that the males provide non-genetic resources to females. This prediction is supported in a variety of animals, with reviews revealing that male assistance (such as food or protection), is provided to certain mammals and communally breeding birds in exchange for mating outside the conceptive period. For example, female blackbirds that solicit mating outside the fertile period have increased mate guarding from their pair-bonded partner. This increases protection against other sexually coercive males and ensures the provision of other material benefits.
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Male-male relationships are tense, and affiliation between males is typically expressed by resting in contact, playing, or non-conceptive sex rather than by grooming. Males cooperate in coalitions against potential predators, and also in defense of the group against other males. Occasionally male coalitionary aggression becomes so violent that males are killed, particularly if they are encountered roaming the forest unaccompanied by allies. Because aggression from other male capuchins is the leading cause of death (aside from poaching by humans, where there is contact between humans and capuchins), male allies are critical for self-defense during migration, and to assist in taking over other groups.
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A synthetic stimulant/conceptive was placed in her by a peacekeeper Leviathan expert called Velorek, leader of the experiment. It was accidentally released by Ka D'Argo six months after their escape from peacekeeper captivity, leading to the conception of a fetus. Roughly six months later, Moya gave birth to a baby Leviathan, though the baby was far from normal: unlike typical Leviathans, which are streamlined and have no weapons whatsoever, the infant was "covered with weapons." During the birthing process, Talyn's external weaponry caused him to become stuck in the birth canal, and he had to fire a low-yield shot from those same weapons to free himself.
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