Instead, bisexuality can be due to normal variation in brain plasticity. They also found that marriages with a bisexual female were happier than heterosexual unions, observed less instance of hidden infidelity, and ended in divorce less frequently. Although grouped with homosexuals, the INAH 3 size of the one bisexual subject was similar to that of the heterosexual men. 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. 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. In his view, this was true anatomically and therefore also psychologically, with sexual attraction to both sexes being an aspect of this psychological bisexuality. LeVay compares Hirschfeld's scale to that developed by Kinsey decades later. Prenatal hormones and sexual orientation , Fraternal birth order and sexual orientation , and Innate bisexuality There is no consensus among scientists about the exact reasons that an individual develops a heterosexual, bisexual or homosexual orientation. The reasoning behind this is that "coming-out" had become primarily the territory of the gay and lesbian, with bisexuals feeling the push to be one or the other and being right only half the time either way.
Bindel has described female bisexuality as a "fashionable trend" being promoted due to "sexual hedonism" and broached the question of whether bisexuality even exists. In other words, someone does not have to be exclusively homosexual or heterosexual, but can feel varying degrees of both. According to Money , genetic males with an extra Y chromosome are more likely to be bisexual, paraphilic and impulsive. 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. In addition to the discrimination associated with homophobia , bisexuals frequently contend with discrimination from gay men, lesbians, and straight society around the word bisexual and bisexual identity itself. In the heterosexist view, people are presumed to be sexually attracted to the opposite sex, and it is sometimes reasoned that a bisexual person is simply a heterosexual person who is sexually experimenting. Common lesbian-feminist critiques leveled at bisexuality were that bisexuality was anti-feminist , that bisexuality was a form of false consciousness , and that bisexual women who pursue relationships with men were "deluded and desperate. Others have had homosexual experiences but do not consider themselves to be gay, lesbian, or bisexual. Therefore, the brain could be feminized while other features, such as the 2D: This study did not explore societal norms, prejudices, or the feminization of homosexual males. 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. Some who identify as bisexual may merge themselves into either homosexual or heterosexual society. Rather, LGB individuals are often raised in communities that are either ignorant of or openly hostile toward homosexuality. 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. Psychologist Beth Firestein states that bisexuals tend to internalize social tensions related to their choice of partners  and feel pressured to label themselves as homosexuals instead of occupying the difficult middle ground where attraction to people of both sexes would defy society's value on monogamy. For some, BDSM and kink provides a platform in creating identities that are fluid, ever-changing. There is increasing inclusion and visibility of bisexuals, particularly in the LGBT community. The authors said that this change in recruitment strategy was an important difference, but it may not have been a representative sample of bisexual-identified men. Dixon found that bisexual men had more sexual activities with women than did heterosexual men. 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. A widely studied example of lesbian-bisexual conflict within feminism was the Northampton Pride March during the years between and , where many feminists involved debated over whether bisexuals should be included and whether or not bisexuality was compatible with feminism. 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. They found that the self-identified bisexual men in their sample had genital arousal patterns similar to either homosexual or heterosexual men. Freud did not claim that everyone is bisexual in the sense of feeling the same level of sexual attraction to both genders. Jeffreys states that while gay men are unlikely to sexually harass women, bisexual men are just as likely to be bothersome to women as heterosexual men. 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.
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