Bisexuality is romantic attraction, sexual attraction , or sexual behavior toward both males and females,    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,    and the concept is one of the three main classifications of sexual orientation along with heterosexuality and homosexuality , all 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 orientation, but they theorize that it is caused by a complex interplay of genetic , hormonal , and environmental influences ,    and do not view it as a choice. Bisexuality has been observed in various human societies  and elsewhere in the animal kingdom    throughout recorded history. The term bisexuality , however, like the terms hetero- and homosexuality , was coined in the 19th century.
The rise in Americans saying they are bisexual is driven by women
Bisexual pride flag - Wikipedia
The bisexual pride flag was designed by Michael Page in in order to give the bisexual community its own symbol comparable to the gay pride flag of the larger LGBT community. His aim was to increase the visibility of bisexuals, both among society as a whole and within the LGBT community. Biangles, or bisexuality triangles, are another symbol for the bisexual community with unclear origins. The crescent moon symbol is another symbol for bisexuality that deliberately avoids the imagery of the pink triangle. Page describes the meaning of the pink, lavender, and blue ratio flag  as this: "The pink color represents sexual attraction to the same sex only gay and lesbian. The blue represents sexual attraction to the opposite sex only straight and the resultant overlap color purple represents sexual attraction to both sexes bi.
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