Animals don't do sexual identity. Dixon found that bisexual men had more sexual activities with women than did heterosexual men. There is increasing inclusion and visibility of bisexuals, particularly in the LGBT community. Driscoll stated that homosexual and bisexual behavior is quite common in several species and that it fosters bonding: Based on this and other findings, they suggested that bisexuality is more influenced by social and sexual learning than is exclusive homosexuality. This is contradictory to another hypothesis that homosexual preferences may be due to a feminized brain in males.
In , researchers Gerulf Rieger, Meredith L. Weinberg and Colin J. LeVay compares Hirschfeld's scale to that developed by Kinsey decades later. 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. In other words, someone does not have to be exclusively homosexual or heterosexual, but can feel varying degrees of both. 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. Disease or Way of Life? He concluded that the standing of bisexuals in the BDSM and kink community was unchanged, and believed that positive shifts in attitude were moderated by society's changing views towards different sexualities and orientations. 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. There are several studies suggesting that bisexuals have a high degree of masculinization. In a longitudinal study about sexual identity development among lesbian, gay, and bisexual LGB youths, Rosario et al. In his view, this was true anatomically and therefore also psychologically, with sexual attraction to both sexes being an aspect of this psychological bisexuality. While heterosexual, homosexual and bisexual men have been found to exhibit similar patterns of hearing, there was a notable differential within a sub-group of males identified as hyperfeminized homosexual males who exhibited test results similar to heterosexual women. LaTorre and Wendenberg found differing personality characteristics for bisexual, heterosexual and homosexual women. 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. 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. Weinberg , and Sue Kiefer Hammersmith, writing in Sexual Preference , reported that sexual preference was much less strongly connected with pre-adult sexual feelings among bisexuals than it was among heterosexuals and homosexuals. Participants were recruited via advertisements in gay-oriented magazines and an alternative paper. They just do sex. 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. 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. 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. This study did not explore societal norms, prejudices, or the feminization of homosexual males. 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. 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. Furthermore, bisexuality does not always represent a halfway point between the dichotomy. Michael Bailey used penile plethysmography to measure the arousal of self-identified bisexual men to pornography involving only men and pornography involving only women.
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