Bisexual is used to describe individuals that experiences a romantic and/or sexual attraction towards multiple or all genders, or indeed, regardless of gender or sex.

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a person who experiences romantic/sexual (or exclusively sexual when used with an -romantic qualifier) to multiple or all genders; somebody who is neither monosexual or asexual.

An increasingly common misconception is that bisexuality is an attraction to men and women exclusively, to the exclusion of nonbinary or transgender people, due to the prefix “bi”, meaning “two”, referring to the two extreme points of the gender binary. This has been fiercely rejected by the bisexual community; many of whom are transgender or nonbinary themselves.

The definition of bisexuality has also referred to being simultaneously heterosexual and homosexual in varying degrees (“homo-” meaning same, “hetero-” meaning different).

Bisexuality can also be seen as the middle spectrum between androsexuality and gynesexuality, or as being simultaneously androsexual and gynesexual. 

As a result, bisexuality – in the theoretical sense – encompasses a wide variety of other identities, such as polysexual, pansexual, bicurious, multisexual, omnisexual, etc. Together, these form what is known as the bisexual+ umbrella.

As such, bisexual people may also identify alongside other identities such as polysexual, omnisexual or pansexual, and it’s also important to note that pan, poly, omni, etc, people may not necessarily identify as bi as well.

Bisexuals may not necessarily experience attraction to every gender in similar amounts; for example, somebody who identifies as bisexual may be primarily more attracted to one gender more than another.