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35, 38), suggesting that lesbians an animal model of sexual orientation. Dog fucking naughty lesbian pussy Perfect-looking babe with pierced pussy loves dog beastiality Sexy ladies are playing with their trained doggy. It's no surprise that like nearly all animals, yes, male cats (toms) have been Be you straight, gay, lesbian or bisexual, sexual orientation has.
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But what does unnatural really mean? The definition of the term is something that goes against natural or human laws, especially in relation to morality. A male is born with a predisposition to mate with a female, since the aim is the reproduction of the species.
This is something determined by nature. But is it really like this? In the animal kingdom there are many examples animals homosexuality that completely dismantle the theories that associate these practices with a purely cognitive trait of human beings. In fact, in some species, homosexuality represents an evolutionary animals. Inzoologist Konrad Lorenz published a study in which he studied the behaviour of 1, animal species. He observed that of these exhibited sexual intercourse, courtship, emotional bonds, partnership and even child-rearing behaviour between homosexual individuals.
From primates to intestinal parasites. A animals later, a study conducted by Dr. These behaviours were different for each species, but in most cases they were an advantageous, evolutionary mechanism.
In other species, such as fruit flies and insects in general, sex occurs because of their inability to differentiate between sexes. Geese are monogamous animals. They spend their lives with a single mate and only look for another if the first one dies. The sex Kurt Kotrschalfollowing on from the studies of Konrad Lorenz, has devoted many years to studying these animals. His research supports the idea that homosexuality is useful for the species.
InLorenz stated that male mates are more likely to occupy a animals level within geese colonies. This allows them to fertilise solitary females, while continuing with their same sex partners. This is one of the theories that reports the evolutionary advantage of homosexuality, but it animals not the only one. These studies explore the idea of homosexual behaviour as an evolutionary response to environmental and.
The environment is what determines these changes, driving species to change sex sexual and sex behaviours. In the case of American bisonpolecats or elephantsboth males and females have been observed courting and mating with others the same sex. In the case of giraffes9 out of 10 couplings occur between males.
As animals birds, all species that form parental relationships do so, to a greater or lesser extent, with members of the same sex. Sex many as a quarter of black swans are homosexual. Penguins have even struck up same-sex relationships in zoos in different parts of the world.
It is interesting to note and the strong rejection of homosexuality by most societies throughout history has disadvantaged the emergence of a very different reality.
A and in which relationships between individuals and the same sex occur in all species and are part of their evolutionary development. In most cases, studies on this subject were avoided for fear of rejection by the and community and the wider social context marked by machismo sex homophobia.
Even today, it remains a taboo subject in many parts of the world where homosexuality is forbidden or even punishable by death. Is irrational animal behavior a good measure of the morality or even usefulness of a behavior for rational man? This animals a debate about homosexuality as something abnormal and as an individual choice, not as something natural that cannot be chosen. How and. You did yourself and an entire group of human beings a big disservice by posting that nonsense for all to see.
Eleanor is obviously living on another planet. I hope her remarks are dismissedand treated as nonsensejust as sex observed, Sandra.
You should check out the statistics on the murder of pregnant women. There are also hundreds of cases where a parent kills their children. Can you honestly say that animal are different than humans???
At least one third of all female homicide victims in the U. I am and physician and of course understand lesbians difference of transexual people.
If the males still have sex with females sex they are not gay… this is not good evidence and gayness being natural as all of those examples the animals still mate for reproduction. This article shows an outstanding look at and reality of the relationships of animals. Thank you. Homosexual behavior is animals lesbians not simply putting a head on the shoulder of another male. It has been well documented that it included and sexual lesbians including penetrations and ejaculation.
The pictures are only to lesbians attached to the text. Same sex animals are capable of showing affection to each other without being classified as Homosexual. Humans have friends, animals develop friendships bonds too. Why do these friendships have to be categorized as homosexuality? Animals being affectionate to their own Family is not an animals of homosexuality.
How many of these animals photographed are actually captured mating with each other????????? It is about you reading the text and the references that sex in it of scientific studies that expose these theories.
If you read these studies you will realize that it is not about affection. Save my name, email, and website in this browser for the next time I comment. Leave this field empty. Gallery Blog Shop. Sign in. Lesbians into your account. Privacy and cookies policy. Password recovery. Contact us. Zoo Portraits. Home Animal Lesbians. Index 1 Scientific studies and references 2 And geese and evolutionary theory 3 Other animals with homosexual behaviour 4 The social taboo against science.
Lots of fun for everyone interested in animals and anyone who wants to join the movement to help protect them. Perfect as a gift or statement for your wall, whether they adorn the lesbians or office they are sure to get people giggling! Next time you need to send lesbians wishes to a loved one, you can do it with sex Zoo Portrait animal! Which one are you? Perception in the animal kingdom: three unique information systems.
The social system of dominance in animals: hierarchy and submission. Lesbians Big Five: the wildlife stars of African bush. How does animal behaviour develop? Biogeographic movements: dispersal, dissemination and migration. Sadly, you are delusional to think that humans are not animals. That is a scientific FACT. I am appalled by your lack animals knowledge and find you claim to be a physical hard to belief.
I know that with kissing fish only the males are the ones that kiss. Please enter your comment! Please enter your name here. You have entered an incorrect email address! More articles. Sex Vallejo - 23 July, For many years, it has been been thought that living beings were basically organisms that are born, grow, reproduce and die, or that they Introducing the all-new Zoo Portraits lesbians Re-imagining the wild: the art of nature writing, past and present 18 April, The domestication of animals: origins, general characteristics and stages 14 Animals, Edge effects and habitat fragmentation: the main causes of species extinction 7 Animals, Our portraits of animals wearing clothes are caricatures.
Our site has lots of different features for you to explore. Welcome to the site, take a lesbians around and find your animal side!
Acorn woodpecker  Adelie penguin  American flamingo  American herring gull  Anna's hummingbird  Australian shelduck  Aztec parakeet  Bengalese finch domestic  Bank swallow  Barn owl  Bearded vulture  Bicolored antbird  Black-billed magpie  Black-Capped Chickadee  Black-crowned night heron  Black-headed gull  Black-rumped flameback  Black stilt  Black swan   Black-winged stilt  Blue-backed manakin  Blue-bellied roller  Blue crowned conure  Blue tit  Blue-winged teal  Brown-headed cowbird  Budgerigar domestic  Buff-breasted sandpiper  Calfbird  California gull  Canada goose  Canary-winged parakeet  Caspian tern  Cattle egret  Cockatiel [ citation needed ] Common chaffinch  Chicken  Chilean flamingo  Chiloe wigeon  Chinstrap penguin  Cliff swallow  Common gull  Common murre  Common shelduck  Crane spp.
Archived from the original on 29 September Retrieved 16 June Bagemihl, Bruce Irreconcilable Differences? Cooper, J. Dunkle, S. Entomological News , pp. Retrieved on 16 June Eaton, R. The World's Cats , vol. II; pp. Forger, Nancy G. Frank, S. Marc Breedlove, Stephen E. Glickman 6 December Retrieved 11 September Live Science.
Retrieved 19 June Goudarzi, Sara 16 November Retrieved on 12 September Harrold, Max February 16, The Advocate Retrieved March 10, At pages and with photos and documentation of homosexual behaviour in more than species of mammals, birds, repties, and insects, Biological Exuberance brings the dusty facts to light as Bagemihl deconstructs the all-heterosexual Noah's Ark we've been sold. Holekamp, Kay E. Research: Spotted Hyena - Introduction and Overview.
Michigan State University , Department of Zoology]. Recall, however, that genital structures and the brain supporting behavior presumably differentiate at different times during embryonic life see Ref.
It is therefore possible that the hormonal imprinting that takes place at these two time periods is substantially different. A male embryo could for example be exposed to high male typical concentrations of testosterone during the first three months of gestation and have perfectly masculine genitalia but then experience a temporary?
Alternatively, the differentiation of sexual orientation could diverge from genital morphology, because steroid action in the brain may be affected while remaining normal in the genital skin.
Any aspect of this complex suite of actions could be deficient in the brain but not in the periphery, leading also to a discrepancy between somatic sex differentiation and sexual orientation.
Although this theory remains speculative and is likely to remain unproven due to the logistic difficulties mentioned before , two types of evidence suggest that it contributes substantially to the control of sexual orientation in humans.
We must therefore rely on indirect evidence. A number of sexually differentiated morphological, physiological, and behavioral characteristics seem to be irreversibly influenced by embryonic hormones in humans like in animals. Many studies have quantified these features comparatively in homosexual and heterosexual populations to research whether homosexual subjects had been exposed to atypical hormonal conditions during their development.
Positive results were obtained in a number of these studies. The sexually differentiated characteristics that have been studied in this context include variables that could be secondarily affected by homosexuality [ e.
In contrast, other morphological and physiological features are clearly influenced by prenatal testosterone, and it is difficult to conceive how they could possibly be affected secondarily by adult sexual orientation. We briefly discuss three of these traits that are significantly modified in gays or lesbians.
The 2D:4D is significantly smaller in men than in women. This ratio was shown by two out of three studies to be masculinized in CAH women exposed to an excess of androgens in utero and also masculinized in females of a variety of mammalian and even avian species by injection of androgens during embryonic life.
This ratio has therefore been used as a biomarker for embryonic exposure to testosterone in the human fetus 35 , although a number of studies have questioned its reliability e. Multiple studies in humans have shown that this ratio is masculinized smaller in lesbians compared with heterosexual women.
Although there have been occasional failures to replicate this effect, and its significance has been questioned e. Is the effect size meaningful? Does it reflect differences in bone length or in fat accumulation 37 , it has been confirmed by several meta-analyses of available data e.
Interestingly, most studies have failed to detect a corresponding feminization of this feature in gay men, and surprisingly, some studies have even reported a lower hypermasculinized 2D:4D ratio in some gay men A modification of the length of long bones arms and legs , a feature also supposed to be influenced by early exposure to sex steroids, has been reported in gay men One set of studies also investigated the physiology of the inner ear and more specifically the small noises produced in the cochlea presumably by movements of the tympanic membrane, the so-called oto-acoustic emissions OAE.
OAE are produced either spontaneously or in response to short noises in the environment e. These OAE are more frequent in women than in men as well as in females compared with males in a variety of animal species. In animals, OAE are masculinized decrease in frequency after embryonic treatment of females with androgens. OAE were shown to be significantly less frequent in lesbians compared with heterosexual women, again suggesting that these lesbians were exposed to higher concentrations of androgens than usual during early life.
Similar studies assessing other aspects of acoustic physiology e. Interestingly, feminization of these features was never observed in gay men, and some studies even reported hypermasculinization of these traits. Several brain structures have also been shown to be different between homosexual and heterosexual subjects, and in this case, studies focused almost exclusively on males.
The first of these differences concerns the suprachiasmatic nucleus, the central clock of the organism, that was shown to be significantly larger in gay men than in heterosexual subjects However, this nucleus is not sexually differentiated in a control heterosexual population, and its links to reproduction are only indirect.
The significance of this difference and potential relation with sexual orientation are thus difficult to assess. The size of the anterior commissure, measured in the midsagital plane, was reported to be larger in gay men than in heterosexual control subjects This difference is more interesting for the purpose of the present discussion, because the size of this commissure is known to be larger in women than in men.
However the size of this commissure has no obvious relationship to sexual orientation it could relate to functional lateralization , so the meaning of the difference between homosexual and heterosexual men remains difficult to interpret. Subsequent studies showed that INAH3 is significantly smaller in homosexual men than heterosexual men, so that its size is essentially equal to what is observed in women An independent study based on different brains confirmed the reduced size of INAH3 in male homosexuals compared with heterosexuals, although the magnitude of the difference observed in this replication was lower than in the original study and not statistically significant In this study, homosexual men also had a greater cell density more cells per unit volume but a similar total number of neurons in INAH3 than heterosexual men: neurons were more densely packed, potentially because they formed fewer synapses during development?
The mechanisms that control the development of this nucleus in humans are unknown, but INAH3 volume does not seem to depend significantly on hormonal status in adulthood Moreover, lesions of this nucleus in adult male rats or ferrets modifies sexual partner preference, an animal model of sexual orientation.
If the same mechanisms control the development of INAH3 in humans, the smaller INAH3 of gay men could then be a marker of deficient exposure to androgens during ontogeny and even be a cause of the modified sexual orientation. Alternatively, the small INAH3 of gay men could also be a consequence of their sexual orientation. A potential implication of the embryonic hormonal environment in the control of sexual orientation is also supported by studies of various clinical disorders that affect the endocrine system during fetal life.
In some cases, these early endocrine disruptions lead to a complete sex reversal, so that, postnatally, subjects are raised assuming a sex gender that is opposite to their genetic sex. For example XY subjects with complete androgen insensitivity syndrome are born with female genitalia and are typically raised as girls at least until puberty, when the absence of menstruation leads to medical examination and diagnosis.
These subjects usually have a female gender identity and a female-typical sexual orientation they are sexually attracted to men These cases demonstrate that sexual orientation is not necessarily associated with the genetic sex but tell us little about the role of prenatal hormones vs.
The rise in plasma testosterone associated with puberty later masculinizes at least in part the genital structures, and these individuals usually conform to a male gender and male-typical sexual orientation.
However, the condition of these subjects is usually known from birth, so that their sex of rearing was not necessarily unequivocally female. In other clinical conditions, however, the prenatal endocrine environment may push sexual orientation in a direction opposite to the effects of postnatal social environment.
These cases therefore provide a more useful test of the role of either type of factor. Three such clinical conditions are important to mention here, because they are associated with a significantly increased incidence of homosexual orientation.
Girls exposed in utero to abnormally high levels of androgens not only show masculinization of genital structures and of a variety of behavioral traits e. Because the endocrine defect was corrected soon after birth, genital structures were surgically feminized, and these girls were presumably raised as girls, these data therefore suggest that prenatal androgens are involved in the determination of sexual orientation in women.
This effect of prenatal androgens could be mediated through a direct action on the brain as well as through an indirect action on the genitalia that would secondarily induce an overall reduction of sexual activity and interest in sex in general, or more specifically of heterosexual activity.
Although genitalia are surgically feminized at birth, they still do not have an ideal structure in some women and therefore allow little or no penetrative heterosexual relationships. These modified genitalia could also induce a general aversion toward sexual activity see Ref. Between and , about 2 million pregnant women were treated with DES in Europe and the United States to prevent spontaneous miscarriages.
This treatment turned out to be ineffective and also to have detrimental long-term consequences, but one of the unexpected outcomes was that girls born from these treated mothers showed a significant increase in nonheterosexual bisexual or homosexual fantasies or sexual activity, whereas the socialization of these subjects was fundamentally consistent with their genetic female sex 54 , The reproducibility of this effect has been questioned, but if the effect of DES is real, which will be difficult to confirm given that this treatment has been abandoned for a long time, it would indicate that estrogens as well as androgens testosterone are able to masculinize sexual orientation.
This would fit with rodent data, where many effects of testosterone on sexual differentiation are produced after conversion into estradiol by aromatase in the brain, but would be in conflict with other data from humans that assign a prominent role to androgens in sexual differentiation. Note, however, that in rhesus monkeys, fetal exposure to DES was shown to increase adult mounting behavior although not to the male-typical level Complex genito-urinary malformations occasionally occur during embryonic development resulting in the birth of XY males who, in addition to various malformations of the pelvis, have no penis.
These subjects have normal testes and were thus presumably exposed to a male-typical pattern of androgen secretions before birth. Typically, in the past, these subjects were assigned a female sex, submitted to vaginoplasty, and raised as girls. Follow-up studies have demonstrated that in a significant number of cases about half , when adults, these subjects chose to adopt a male identity, gender role, and male-typical sexual orientation that presumably relate to their embryonic exposure to androgens 57 , Altogether, these clinical cases are consistent with the idea that embryonic hormones play a substantial role in determining adult sexual orientation.
If embryonic hormones affect adult sexual orientation, then what is the cause of the endocrine changes that result in an atypical orientation in some subjects? Based on retrospective analysis of men born in Berlin during World War II with all the problems that are potentially associated with such an approach , it has been suggested that exposure to chronic stress might be a critical determinant 59 — 61 , but to our knowledge, these data have never been replicated and are considered unreliable by some authors.
Individual genetic differences could affect the synthesis of steroid hormones or their activity in the brain of the embryo, although to date, no evidence for such a mechanism has been obtained despite active research 62 — Alternatively, studies in mice indicate that genes located on the sex chromosomes contribute in a direct manner to the sexual differentiation of brain and behavior 5.
Various arguments suggest a significant genetic contribution to sexual orientation. Whether this partial genetic control is mediated by alterations of steroid action or more directly by a sexually differentiated expression of specific genes has not been determined. Multiple epidemiological studies have demonstrated a correlation between concordance of sexual orientation and genetic relatedness.
Similarly, lesbian women have a greater probability than heterosexual women of having a homosexual sister. Twins studies indicate that this correspondence in sexual orientation probably does not reflect a communality of postnatal experiences psychosocial factors but rather genetic similarity. Several studies indeed demonstrated that there is a better agreement of sexual orientation in monozygotic identical twins than in dizygotic twins fraternal twins conceived from different ova and sperm Although this genetic contribution was identified many years ago, the responsible gene s remain s unknown.
Sexual orientation in men tends to be transmitted through the matriarchal lineage: a gay man has a higher probability of having gay men among his ancestors on the maternal side uncles, cousins , than on the paternal side. This was originally interpreted as a sign of inheritance through gene s located on the X chromosome, and one study identified a linkage with markers located in the subtelomeric region of the long arm of the X chromosome, a region called Xq28 This association with Xq28 was replicated in one subsequent study 68 and in another set of data that were not published in a peer-reviewed journal see Ref.
More recent studies have suggested that the differential heritage through the matriarchal lineage could also be the result of epigenetic modifications of the expression of genes located on several other chromosomes 71 , In summary, the existence of a genetic contribution to the control of sexual orientation is now firmly established, but the specific gene s that are implicated in this process have not been identified so far. Whether or not this these gene s affect sexual orientation by modifying steroid secretion or action during ontogeny has also not been determined.
Finally, to complete the picture of biological factors affecting sexual orientation, it should be noted that the factor most reliably associated with homosexuality in males is the presence in the family of older brothers born of the same mother.
These effects do not appear to be explained by differences in education or family background and may be the result of accumulation of antibodies in the mother during successive pregnancies against one or more proteins expressed specifically by the male brain. This interpretation currently remains an untested hypothesis and the specific antigenic proteins underlying this phenomenon have not been identified. Candidate proteins have, however, been suggested as potential target s for this immune reaction based on their distribution and properties Whether this effect involves hormone actions is unknown.
There is thus substantial evidence suggesting that sexual orientation, and homosexuality in particular, is influenced before birth by a set of biological mechanisms.
These mechanisms include genes that affect sexual orientation by currently unidentified mechanisms and hormonal actions classically mediating sexual differentiation. Our current understanding of these prenatal factors admittedly suffers many limitations.
They are statistically correlated with sexual orientation but are unable to predict it accurately due to the large variance in this relationship. The limitations of the results probably relate not only to the complexity of the behavioral trait under consideration but also to methodological difficulties specific to their study, such as the long latency between putative hormone actions and their effects, the absence for ethical reasons of truly experimental studies, and the taboos associated with human sexuality.
One should also consider that gays and lesbians probably do not constitute homogeneous populations. In addition to the obvious gradation between heterosexuality and homosexuality that was already recognized by Kinsey et al. These differences are unfortunately rarely taken into account in experimental studies. Despite these limitations, I believe that biological studies suggest a significant contribution of genetic and hormonal factors in the control of sexual orientation.
In contrast, alternative explanations based on features of the postnatal environment, such as relationships with parents, social interactions, or early sexual experiences, although they are widely accepted in the public, are not usually supported by quantitative experimental studies.
It is clear, however, that none of the biological factors identified so far is able to explain by itself the incidence of homosexuality in all individuals. Three possibilities can be contemplated to explain this failure. Either there are different types of homosexuality. Some forms could be determined by genetic effects, others by hormones, and yet others by the older brothers effect and the associated immunological modifications.
Or the effects of different biological factors interact to varying degrees in each individual, and it is only when several of these predisposing factors are combined that an homosexual orientation is observed. Or finally, all biological factors that have been associated with homosexuality only become effective in conjunction with exposure to a given as yet unspecified psychosocial postnatal environment.
The postnatal environment would in this scenario play an important permissive role, but it is then surprising that no quantitative study has been able so far to formally identify aspects of this environment that play this limiting role in the control of sexual orientation.
It has, however, been suggested that embryonic hormones may directly affect aspects of juvenile behavior e. Current knowledge does not allow discriminating between these interpretations see Ref.
It is clear, however, that biological factors acting during prenatal life play a significant role in the control of sexual orientation and that homosexuality is not, for most people, the result only of postnatal experiences or a free choice.
It is often an awareness that presents itself to the individual during their adolescence or early adult life. The acceptance of a nonheterosexual orientation in a minority of subjects is often the cause of significant psychological distress and social isolation. In contrast, heterosexual orientation emerges with the individual often being unaware of the underlying process.
There is no question of choice here. Data presented in this review strongly suggest that most human beings do not choose to be heterosexual or homosexual. What they choose is to assume or not their orientation and eventually reveal it openly. Custom Maid 3D : Have fun with my two awesome maid. The Witcher Ciri porn music compilation Hot Lesbians go at it in this juicy pussy filled bedroom romp Nightcore Lean On?
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