Bisexuality is romantic attraction, sexual attractionor sexual behavior toward both males and females,    or romantic or sexual attraction to people of any sex or gender identity ; this latter is sometimes alternatively termed pansexuality. The term bisexuality is mainly used in the context of human attraction to denote romantic or sexual feelings toward both men and women,    and Definicion de herterosexual concept is one of the three main classifications of sexual orientation along with heterosexuality and homosexualityall of which exist on the heterosexual—homosexual continuum.
A bisexual identity does not necessarily equate to equal sexual attraction to both sexes; commonly, people who have a distinct but not exclusive sexual preference for one sex over the other also identify themselves as bisexual.
Bisexuality has been observed in various human societies  and elsewhere in the animal kingdom    throughout recorded history. The term bisexualityhowever, like the terms hetero- and homosexualitywas coined in the 19th century. Bisexuality is romantic or sexual attraction to both males and females.
The American Psychological Association states that "sexual orientation falls along
Definicion de herterosexual continuum.
In other words, someone does not have to be exclusively homosexual or heterosexual, but can feel varying degrees of both.
Sexual orientation develops across a person's lifetime—different people realize at different points in their lives that they are heterosexual, bisexual or homosexual. Sexual attraction, behavior, and identity may also be incongruent, as sexual attraction or behavior may not necessarily be consistent with identity. Some individuals identify themselves as heterosexual, homosexual, or bisexual without having had any sexual experience.
Others have had homosexual experiences but do not consider themselves to be gay, lesbian, or bisexual. Some sources state that bisexuality encompasses romantic or sexual attraction to all gender identities or that it is romantic or sexual attraction to a person irrespective of that person's biological sex or gender, equating it to or rendering it interchangeable with pansexuality.
Unlike members of other minority groups e. Rather, LGB individuals are often raised in communities that are either ignorant of or openly hostile toward homosexuality.
Bisexuality as a transitional identity has also been examined. In a longitudinal study about sexual identity development among lesbian, gay, and bisexual LGB youths, Rosario et al. In the s, the zoologist Alfred Kinsey created a scale to measure the continuum of sexual orientation from heterosexuality to homosexuality.
Kinsey studied human sexuality and argued that people have the capability of being hetero- or homosexual even if this trait does not present itself in the current circumstances. It ranges from 0, meaning exclusively heterosexual, Definicion de herterosexual 6, meaning exclusively homosexual.
Weinberg and Colin J.
Definicion de herterosexual write that, in principle, people who rank anywhere from 1 to 5 could be considered bisexual. The psychologist Jim McKnight writes
Definicion de herterosexual while the idea that bisexuality is a form of sexual orientation intermediate between homosexuality and heterosexuality is implicit in the Kinsey scale, that conception has been "severely challenged" since the publication of Homosexualitiesby Weinberg and the psychologist Alan P.
More modern studies estimating the demographics for bisexuality have varied. The same study found that 2. From an anthropological perspective, there is large variation in the prevalence of bisexuality between different cultures. Among some tribes, it appears to be non-existent while in others a universal, including the Sambia of New Guinea and similar Melanesian cultures. There is no consensus among scientists about the exact reasons that an individual develops a heterosexual, bisexual or homosexual orientation.
The American Academy of Pediatrics has stated that "sexual orientation probably is not determined by any one factor but by a combination of genetic, hormonal, and environmental influences. It further stated that, for most people, sexual orientation is determined at an early age. Similarly, no specific psychosocial or family dynamic cause for homosexuality has been identified, including histories of childhood sexual abuse.
Magnus Hirschfeld argued that adult sexual orientation can be explained in terms of the bisexual nature of the developing fetus: In most fetuses, the center for attraction to the opposite sex developed while the center for attraction to the same sex regressed, but in fetuses that became homosexual, the reverse occurred.
Simon LeVay has criticized Hirschfeld's theory of an early bisexual Definicion de herterosexual of development, calling it confusing; LeVay maintains that Hirschfeld failed distinguish between saying that the brain is sexually undifferentiated at an early stage of development and saying that an individual actually experiences sexual attraction to both men and women.
According Definicion de herterosexual LeVay, Hirschfeld believed that in most bisexual people the strength of attraction to the same sex was relatively low, and that it was therefore possible to restrain its development in young people, something Hirschfeld supported.
On this scale, someone who was A3, B9 would be weakly attracted to the opposite sex and very strongly attracted to the same sex, an A0, B0 would be asexual, and an A10, B10 would be very attracted to both sexes. LeVay compares Hirschfeld's scale to that developed by Kinsey decades later. Sigmund Freud believed that every human being is bisexual in the sense of incorporating general attributes of both sexes. In his view, this was true anatomically and therefore also psychologically, with sexual attraction to both sexes being an aspect of this psychological bisexuality.
Freud believed that in the course of sexual development the masculine side of this bisexual disposition would normally become dominant in men and the feminine side in women, but that all adults still have desires derived from both the masculine and the feminine sides of their natures. Freud did not claim that everyone is bisexual in the sense of feeling the same level of sexual attraction to both genders.
Disease or Way of Life? BellMartin S.
Weinbergand Sue Kiefer Hammersmith, writing in Sexual Preferencereported that sexual preference was much less Definicion de herterosexual connected with pre-adult sexual feelings among bisexuals than it was among heterosexuals and homosexuals. Based on this and other findings, they suggested that bisexuality is more influenced by social and sexual learning than is exclusive homosexuality. Human bisexuality has mainly been studied alongside homosexuality.
Van Wyk and Geist argue that this is a problem for sexuality research because the few studies that have observed bisexuals separately have found that bisexuals are often different from both heterosexuals and homosexuals. Furthermore, bisexuality does not always represent a halfway point between the dichotomy. Research indicates that bisexuality is influenced by biological, cognitive and cultural variables in interaction, and this leads to different types of bisexuality. In the current debate around influences on sexual orientation, biological explanations have been questioned by social scientists, particularly by feminists who encourage women to make conscious decisions their life and sexuality.
A difference in attitude between homosexual men and women has also been reported, with men more likely to regard their sexuality as biological, "reflecting the universal male experience in Definicion de herterosexual culture, not the complexities of the lesbian world.
The critic Camille Paglia has promoted bisexuality as an ideal. Bisexuality and the Eroticism of Everyday Life, in which she argued that most people would be bisexual if not for repression and other factors such as lack of sexual opportunity.
LeVay's examination at autopsy of 18 homosexual men, 1 bisexual man, 16 presumably heterosexual men and 6 presumably heterosexual women found that the INAH 3 nucleus of the anterior hypothalamus of homosexual men was smaller than that of heterosexual men and closer in size of heterosexual women.
Although grouped with homosexuals, the INAH 3 size of the one bisexual subject was similar to that of the heterosexual men. Some evidence supports the concept of biological precursors of bisexual orientation in genetic males. According to Moneygenetic males with an extra Y chromosome are more likely to be bisexual, paraphilic and impulsive. Some evolutionary psychologists have argued that same-sex attraction "Definicion de herterosexual" not have adaptive value because it Definicion de herterosexual no association with potential reproductive success.
Instead, bisexuality can be due to normal variation in brain plasticity. More recently, it has been suggested that same-sex alliances may have helped males climb the social hierarchy giving access to females and reproductive opportunities.
Same-sex allies could have helped females to move to the safer and resource richer center of the group, which increased their chances of raising their offspring successfully. Brendan Zietsch of the Queensland Institute of Medical Research proposes the alternative theory that men exhibiting female traits become Definicion de herterosexual attractive to females and are thus more likely to mate, provided the genes involved do not drive them to complete rejection of heterosexuality.
Also, in a study, its authors stated that "There is considerable evidence that human sexual orientation is genetically influenced, so it is not known how homosexuality,
Definicion de herterosexual tends to lower reproductive success, is maintained in the population at a relatively high frequency. Driscoll stated that homosexual and bisexual behavior is quite "Definicion de herterosexual" in several species and that it fosters bonding: The article also stated: Rather, many species seem to have ingrained homosexual tendencies that are a regular part of their society.
That is, there are probably no strictly gay critters, just bisexual ones. Animals don't do sexual identity. They just do sex. Masculinization of women and hypermasculinization of men has been a central theme in sexual orientation research. There are several studies suggesting that bisexuals have a high degree of masculinization. LaTorre and Wendenberg found differing personality characteristics for bisexual, heterosexual and homosexual women.
Bisexuals were found to have fewer personal insecurities than heterosexuals and homosexuals. This finding defined bisexuals as self-assured and less likely to suffer from mental instabilities.
The confidence of a secure identity consistently translated to more masculinity than other subjects. This study did not explore societal norms, prejudices, or the feminization of homosexual males. In a research comparison, published in the Journal of the Association for Research in Otolaryngologywomen usually have a better hearing sensitivity than males, assumed by researchers as a genetic disposition connected to child bearing. Homosexual and bisexual women have been found to have a hypersensitivity to sound in comparison to heterosexual women, suggesting a genetic disposition to not tolerate high pitched tones.