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Bogens og undersøgelsens udgangspunkt er, at biseksualitet er blevet studeret alt for lidt, og at alt for mange undersøgelser af seksualitet og seksuel orientering tager udgangspunkt i, at man enten er heteroseksuel eller homoseksuel. På det tidspunkt forekom det mig overhovedet ikke at jeg var anderledes, bisexual sex med kvinder. Vi skal prøve en radikal behandling på dig. Der er ingen faste regler for, hvordan man skal leve sit liv, blot fordi man definerer sig selv som biseksuel.
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Hejsa søger en sød pige eller et par til Lørdag den 3 Marts om aftenen: Du kan som biseksuel have kærester af begge køn livet igennem, eller du kan vælge udelukkende at have fx kvinder som kærester. Der er ingen faste regler Fordi du bliver tiltrukket af og dyrker sex med personer af begge køn, er du ikke nødvendigvis biseksuel, med mindre du definerer dig som biseksuel. Nogle kvinder siger lige frem, at sex med kvinder er bedst, mens kærlighed og romantik til gengæld er bedst med mænd.
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Se nærmere på jakken herunder. Barash and Lipton note:. The highest known frequency of extra-pair copulations are found among the fairy-wrens , lovely tropical creatures technically known as Malurus splendens and Malurus cyaneus.
Such low levels of genetic monogamy have surprised biologists and zoologists, forcing them to rethink the role of social monogamy in evolution. They can no longer assume social monogamy determines how genes are distributed in a species. The lower the rates of genetic monogamy among socially monogamous pairs, the less of a role social monogamy plays in determining how genes are distributed among offspring. Polygyny occurs when one male gets exclusive mating rights with multiple females.
In some species, notably those with harem -like structures, only one of a few males in a group of females will mate. Technically, polygyny in sociobiology and zoology is defined as a system in which a male has a relationship with more than one female, but the females are predominantly bonded to a single male.
Should the active male be driven out, killed, or otherwise removed from the group, in a number of species the new male will ensure that breeding resources are not wasted on another male's young. Von Haartman specifically described the mating behaviour of the European pied flycatcher as successive polygyny. Males then create a second territory, presumably in order to attract a secondary female to breed. Even when they succeed at acquiring a second mate, the males typically return to the first female to exclusively provide for her and her offspring.
Polyandry occurs when one female gets exclusive mating rights with multiple males. In some species, such as redlip blennies , both polygyny and polyandry are observed. The males in some deep sea anglerfishes are much smaller than the females. When they find a female they bite into her skin, releasing an enzyme that digests the skin of their mouth and her body and fusing the pair down to the blood-vessel level.
The male then slowly atrophies , losing first his digestive organs, then his brain, heart, and eyes, ending as nothing more than a pair of gonads , which release sperm in response to hormones in the female's bloodstream indicating egg release. This extreme sexual dimorphism ensures that, when the female is ready to spawn, she has a mate immediately available. Polygynandry occurs when multiple males mate indiscriminately with multiple females. The numbers of males and females need not be equal, and in vertebrate species studied so far, there are usually fewer males.
Two examples of systems in primates are promiscuous mating chimpanzees and bonobos. These species live in social groups consisting of several males and several females. Each female copulates with many males, and vice versa. In bonobos, the amount of promiscuity is particularly striking because bonobos use sex to alleviate social conflict as well as to reproduce.
The water becomes milky with sperm and the bottom is draped with millions of fertilised eggs. The term polygamy is an umbrella term used to refer generally to non-monogamous matings. As such, polygamous relationships can be polygynous, polyandrous or polygynandrous. In a small number of species, individuals can display either polygamous or monogamous behaviour depending on environmental conditions. An example is the social wasp Apoica flavissima. Polygamy in both sexes has been observed in red flour beetle Tribolium castaneum.
Polygamy is also seen in many Lepidoptera species including Mythimna unipuncta true armyworm moth. A tournament species is one in which "mating tends to be highly polygamous and involves high levels of male-male aggression and competition.
Most polygamous species present high levels of tournament behaviour, with a notable exception being bonobos [ citation needed ].
Female and male sexual behaviour differ in many species. Often, males are more active in initiating mating, and bear the more conspicuous sexual ornamentation like antlers and colourful plumage.
This is a result of anisogamy , where sperm are smaller and much less costly energetically to produce than eggs. This difference in physiological cost means that males are more limited by the number of mates they can secure, while females are limited by the quality of genes of her mates, a phenomenon known as Bateman's principle.
Thus, females are more limited in their potential reproductive success. In hermaphroditic animals, the costs of parental care can be evenly distributed between the sexes, e. In some species of planarians , sexual behaviour takes the form of penis fencing. In this form of copulation, the individual that first penetrates the other with the penis, forces the other to be female, thus carrying the majority of the cost of reproduction.
A hypothesis suggests these slugs may be able to compensate the loss of the male function by directing energy that would have been put towards it to the female function.
Many animal species have specific mating or breeding periods e. In marine species with limited mobility and external fertilisation like corals , sea urchins and clams , the timing of the common spawning is the only externally visible form of sexual behaviour.
In areas with continuously high primary production , some species have a series of breeding seasons throughout the year. This is the case with most primates who are primarily tropical and subtropical animals. Some animals opportunistic breeders breed dependent upon other conditions in their environment aside from time of year.
Mating seasons are often associated with changes to herd or group structure, and behavioural changes, including territorialism amongst individuals. These may be annual e. During these periods, females of most mammalian species are more mentally and physically receptive to sexual advances, a period scientifically described as estrous but commonly described as being "in season" or "in heat".
Sexual behaviour may occur outside estrus,  and such acts as do occur are not necessarily harmful. For these species, the female ovulates due to an external stimulus during, or just prior, to mating, rather than ovulating cyclically or spontaneously. Stimuli causing induced ovulation include the sexual behaviour of coitus, sperm and pheromones. Domestic cats have penile spines. Upon withdrawal of a cat's penis , the spines rake the walls of the female's vagina , which may cause ovulation.
For many amphibians, an annual breeding cycle applies, typically regulated by ambient temperature, precipitation, availability of surface water and food supply. This breeding season is accentuated in temperate regions, in boreal climate the breeding season is typically concentrated to a few short days in the spring. Some species, such as the Rana Clamitans green frog , spend from June to August defending their territory.
In order to protect these territories, they use five vocalizations. Like many coral reef dwellers, the clownfish spawn around the time of the full moon in the wild. In a group of clownfish, there is a strict dominance hierarchy. The largest and most aggressive female is found at the top. Only two clownfish, a male and a female, in a group reproduce through external fertilisation. Clownfish are sequential hermaphrodites, meaning that they develop into males first, and when they mature, they become females.
If the female clownfish is removed from the group, such as by death, one of the largest and most dominant males will become a female. The remaining males will move up a rank in the hierarchy.
Various neurohormones stimulate sexual wanting in animals. In general, studies have suggested that dopamine is involved in sexual incentive motivation, oxytocin and melanocortins in sexual attraction, and noradrenaline in sexual arousal. The mating system of prairie voles is monogamous ; after mating, they form a lifelong bond. In contrast, montane voles have a polygamous mating system.
When montane voles mate, they form no strong attachments, and separate after copulation. Studies [ citation needed ] on the brains of these two species have found that it is two neurohormones and their respective receptors that are responsible for these differences in mating strategies. Male prairie voles release vasopressin after copulation with a partner, and an attachment to their partner then develops. Female prairie voles release oxytocin after copulation with a partner, and similarly develop an attachment to their partner.
Neither male nor female montane voles release high quantities of oxytocin or vasopressin when they mate. Even when injected with these neurohormones, their mating system does not change. In contrast, if prairie voles are injected with the neurohormones, they may form a lifelong attachment, even if they have not mated. It's believed [ by whom? Prairie voles have a greater number of oxytocin and vasopressin receptors compared to montane voles, and are therefore more sensitive to those two neurohormones.
It's believed that it's the quantity of receptors, rather than the quantity of the hormones, that determines the mating system and bond-formation of either species. Mother rats experience a postparum estrus which makes them highly motivated to mate.
However, they also have a strong motivation to protect their newly born pups. As a consequence, the mother rat solicits males to the nest but simultaneously becomes aggressive towards them to protect her young.
If the mother rat is given injections of an oxytocin receptor antagonist , they no longer experience these maternal motivations. Prolactin influences social bonding in rats.
Grooming, sex, and cuddling frequencies correlate positively with levels of oxytocin. As the level of oxytocin increases so does sexual motivation. While oxytocin plays a major role in parent child relationships, it is also found to play a role in adult sexual relationships. Its secretion affects the nature of the relationship or if there will even be a relationship at all. Studies have shown that oxytocin is higher in monkeys in lifelong monogamous relationships compared to monkeys which are single.
Furthermore, the oxytocin levels of the couples correlate positively; when the oxytocin secretion of one increases the other one also increases. Higher levels of oxytocin are related to monkeys expressing more behaviours such as cuddling, grooming and sex, while lower levels of oxytocin reduce motivation for these activities. Research on oxytocin's role in the animal brain suggests that it plays less of a role in behaviours of love and affection than previously believed. Then, in the s, research with prairie voles found that giving them a dose of oxytocin resulted in the formation of a bond with their future mate Azar, Rather, they affect thinking and emotions in variable ways Azar, It is often assumed that animals do not have sex for pleasure, or alternatively that humans, pigs, bonoboes and perhaps dolphins and one or two more species of primates are the only species that do.
This is sometimes stated as "animals mate only for reproduction". This view is considered a misconception by some scholars. He also points to the presence of the clitoris in some female mammals, and evidence for female orgasm in primates. A Danish Animal Ethics Council report,  which examined current knowledge of animal sexuality in the context of legal queries concerning sexual acts by humans, has the following comments, primarily related to domestically common animals:.
Even though the evolution-related purpose of mating can be said to be reproduction, it is not actually the creating of offspring which originally causes them to mate.
It is probable that they mate because they are motivated for the actual copulation, and because this is connected with a positive experience. It is therefore reasonable to assume that there is some form of pleasure or satisfaction connected with the act. This assumption is confirmed by the behaviour of males, who in the case of many species are prepared to work to get access to female animals, especially if the female animal is in oestrus, and males who for breeding purposes are used to having sperm collected become very eager, when the equipment they associate with the collection is taken out.
There is nothing in female mammals ' anatomy or physiology that contradicts that stimulation of the sexual organs and mating is able to be a positive experience.
For instance, the clitoris acts in the same way as with women, and scientific studies have shown that the success of reproduction is improved by stimulation of clitoris on among other species cows and mares in connection with insemination, because it improves the transportation of the sperm due to contractions of the inner genitalia. This probably also applies to female animals of other animal species, and contractions in the inner genitals are seen e.
It is therefore reasonable to assume that sexual intercourse may be linked with a positive experience for female animals. Koinophilia is the love of the "normal" or phenotypically common from the Greek, koinos , meaning "the usual" or "common". The field of study of sexuality in non-human species was a long-standing taboo. In earlier periods, bias tended to support what would now be described as conservative sexual mores. An example of overlooking behaviour relates to descriptions of giraffe mating:.
When nine out of ten pairings occur between males, "[e]very male that sniffed a female was reported as sex, while anal intercourse with orgasm between males was only [categorized as] 'revolving around' dominance , competition or greetings.
In the 21st century, liberal social or sexual views are often projected upon animal subjects of research. Popular discussions of bonobos are a frequently cited example. Current research frequently expresses views such as that of the Natural History Museum at the University of Oslo , which in held an exhibition on animal sexuality:.
Many researchers have described homosexuality as something altogether different from sex. They must realise that animals can have sex with who they will, when they will and without consideration to a researcher's ethical principles. Other animal activities may be misinterpreted due to the frequency and context in which animals perform the behaviour. For example, domestic ruminants display behaviours such as mounting and head-butting.
This often occurs when the animals are establishing dominance relationships and are not necessarily sexually motivated. Careful analysis must be made to interpret what animal motivations are being expressed by those behaviours.
Copulation is the union of the male and female sex organs , the innate sexual activity specifically organized to transmit male sperm into the body of the female. In non-primate mammals for example, rodents , canines , felines , bovines , and equines , the anatomy of the reproductive organs and some circuits of the nervous system are specifically organized for heterosexual copulation.
Alternative male strategies which allow small males to engage in cuckoldry can develop in species such as fish where spawning is dominated by large and aggressive males. Cuckoldry is a variant of polyandry , and can occur with sneak spawners. A sneak spawner is a male that rushes in to join the spawning rush of a spawning pair. In salmon and trout, for example, jack males are common.
These are small silvery males that migrate upstream along with the standard, large, hook-nosed males and that spawn by sneaking into redds to release sperm simultaneously with a mated pair. This behaviour is an evolutionarily stable strategy for reproduction, because it is favoured by natural selection just like the "standard" strategy of large males. Hermaphroditism occurs when a given individual in a species possesses both male and female reproductive organs, or can alternative between possessing first one, and then the other.
Hermaphroditism is common in invertebrates but rare in vertebrates. It can be contrasted with gonochorism , where each individual in a species is either male or female, and remains that way throughout their lives.
Most fish are gonochorists, but hermaphroditism is known to occur in 14 families of teleost fishes. Usually hermaphrodites are sequential , meaning they can switch sex , usually from female to male protogyny. This can happen if a dominant male is removed from a group of females. The largest female in the harem can switch sex over a few days and replace the dominant male.