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Bisexuality is romantic attraction, sexual attractionor sexual behavior toward both males and females, [1] [2] [3] or to more than one sex or gender. The term bisexuality is mainly used in the context of human attraction to denote romantic or sexual feelings toward both men and women, [1] [2] [3] and the 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. Scientists do not know the exact cause of sexual sex, but they theorize that it is caused by a complex interplay of genetichormonaland environmental influences[9] [10] [11] and do not view it as a choice. Bisexuality has been observed in various human societies [16] and elsewhere in the animal kingdom [17] [18] [19] 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 a 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, sex 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 sex 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 sex, Rosario et al. Rosario et al. By contrast, a longitudinal study by Lisa M.

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 sex, to 6, meaning exclusively homosexual.

Weinberg and Colin J. Williams write that, in principle, people who rank anywhere from 1 to 5 could be considered bisexual. The psychologist Jim McKnight writes that 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. Studies estimating the demographics for bisexuality have varied.

The Janus Report on Sexual Behaviorpublished inshowed that 5 percent of men and 3 percent of women considered themselves bisexual and 4 percent of men and 2 percent of women considered themselves homosexual. The same study found that 2.

Across cultures, there is some variance in the prevalence of bisexual behavior, [39] but there sex no persuasive evidence that there is much variance in the sex of same-sex attraction. There is no consensus among scientists about the exact reasons that an individual develops a heterosexual, bisexual or homosexual orientation.

They generally believe that it is determined by a complex interplay of biological and environmental factorsand is shaped at an early age. The American Psychiatric Association stated: "To date there are no replicated scientific studies supporting any specific biological etiology for homosexuality. 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: he believed that in every embryo there is one rudimentary neutral center for attraction sex males and another for attraction to females. In most fetuses, the center for attraction to the opposite sex developed while the center for attraction to the same sex regressed, but sex fetuses that became homosexual, the sex occurred.

Simon LeVay has criticized Hirschfeld's theory of an early bisexual stage of development, calling it confusing; LeVay maintains that Hirschfeld failed to distinguish between saying that the brain is sexually undifferentiated at sex early stage of development and saying that an individual actually experiences sexual attraction to both men and women. According to 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 Freudthe founder sex psychoanalysisbelieved 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. Alan P. BellMartin S. Weinbergand Sue Kiefer Hammersmith reported in Sexual Preference that sexual preference was much less strongly 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 sex 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 sex 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 about 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 this culture, not the complexities of the lesbian world.

The critic Camille Paglia has promoted bisexuality as an ideal. 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 does not have adaptive value because it has 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 sex 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 more 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, which tends to lower reproductive success, is maintained in the population at a relatively high frequency.

Driscoll stated that homosexual and bisexual behavior is quite common in several species and that it fosters bonding: "The more homosexuality, the more peaceful the species". The article also stated: "Unlike most humans, however, individual animals generally cannot be classified as gay or straight: an animal that engages in a same-sex flirtation or partnership does not necessarily shun heterosexual encounters.

Rather, many species seem to have ingrained homosexual tendencies that are a regular part of their sex. 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 sex subjects. This study did not explore societal norms, prejudices, or the feminization of homosexual males. In a research comparison, published sex the Journal sex the Association for Research in Sexwomen 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 sex a hypersensitivity to sound in comparison to heterosexual women, suggesting a genetic disposition to not tolerate high pitched tones.

While sex, homosexual and bisexual men have been found to exhibit similar patterns of hearing, there was a notable differential in a sub-group of males identified as hyperfeminized homosexual males who exhibited test results similar to heterosexual women.

The prenatal hormonal theory of sexual orientation suggests that people who are exposed to excess levels of sex hormones have masculinized brains and show increased homosexuality or bisexuality.

Studies providing evidence for the masculinization of the brain have, however, not been conducted to date.

Research on special conditions such as congenital adrenal hyperplasia CAH and exposure to diethylstilbestrol DES indicate that prenatal exposure to, respectively, excess testosterone and estrogens are associated with female—female sex fantasies in adults.

Both effects are associated with bisexuality rather than homosexuality. There is research evidence that the digit ratio of the length of the 2nd and 4th digits index finger and ring finger is somewhat negatively related to prenatal testosterone and positively to estrogen. Studies measuring the fingers found a statistically significant skew in the 2D:4D ratio long ring finger towards homosexuality with an even lower ratio in bisexuals. It is suggested that exposure to high prenatal testosterone and low prenatal estrogen concentrations is one cause of homosexuality whereas exposure to very high testosterone levels may be associated with bisexuality.

Because testosterone in general is important for sexual differentiation, this view offers an alternative to the suggestion that male homosexuality is genetic.

The prenatal hormonal theory suggests that a homosexual orientation results from exposure to excessive testosterone causing an over-masculinized brain.

This is contradictory to another hypothesis that homosexual preferences may be due to a feminized brain in males. However, it has also been suggested that homosexuality may be due to high prenatal levels of unbound testosterone that results from a lack of receptors at particular brain sites. Therefore, the brain could be feminized while other features, such as the 2D:4D ratio could be over-masculinized.

Van Wyk and Geist summarized several studies comparing bisexuals with hetero- or homosexuals that have indicated that bisexuals have higher rates of sexual activity, fantasy, or erotic interest. These studies found that male and female bisexuals had more heterosexual fantasy than heterosexuals or homosexuals; that sex men had more sexual activities with women than did heterosexual men, and that they masturbated more but had fewer happy marriages than heterosexuals; that bisexual women had more orgasms per week and they described them as stronger than those of hetero- or homosexual women; and that bisexual women became heterosexually active earlier, masturbated and enjoyed masturbation more, and were more experienced in different types of heterosexual contact.

Research suggests that, for most women, high sex drive is associated with increased sexual attraction to both women and men. For men, however, high sex drive is associated with increased attraction to one sex or the other, but not to both, depending on sexual orientation.

Some who identify as bisexual may merge themselves into either homosexual or heterosexual society. Other bisexual people see this merging as enforced rather than voluntary; bisexual people can face exclusion from both homosexual and heterosexual society on coming out.

Researchers tie these results to the internal conflict bi-erasure creates for bisexual people in mixed-gender relationships. The study surveyed mixed-gender couples, each composed of one bisexual person and one person who does not identify as bisexual. The couples on average had been together for 5 years, were years-old at the time of the survey, and were primarily white.

Participants answered a series of questions about overall levels of sexual and romantic satisfaction with their partners.

The results showed that factors such as whether bisexual participants felt their identities were recognized, whether bisexual partners were out to their families and friends, and how they felt about their own identity all had a strong impact on the level of sexual and romantic satisfaction of both partners.

Bisexual participants who felt that their identities were not seen reported lower rates of sexual satisfaction.

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When talking about bisexuality, it is sometimes useful to distinguish between behavior and identity. Someone who has had sexual experience with or even just attractions to people of more than one sex can be described as bisexual, but may not identify that way. Likewise, one can identify as bisexual regardless of sexual experience. Furthermore, identities can change over time. Definitions can change too. My own understanding of bisexuality has changed dramatically over the years.

Then one day I was chatting with my friend Alberto, who, like me, identifies as bisexual. I tossed out my definition and he looked at me like I was crazy. No, no, no!