The terms and definitions below are always evolving and changing and often mean different things to different people. They are provided below as a starting point for discussion and understanding. Ableism: The pervasive system of discrimination and exclusion that oppresses people who have mental, emotional and physical disabilities. Allosexism: The pervasive system of discrimination and exclusion that oppresses asexual people.
GLAAD Media Reference Guide - Lesbian / Gay / Bisexual Glossary Of Terms | GLAAD
Not because they are bad, or homophobic, or transphobic… but because these realities are not their own lived experience, or because working alongside these groups may be a newer experience for them. Becoming familiar with some terms and concepts can be useful to better understand the complexities of sex, gender identity, and sexuality, and will also allow individuals to further support colleagues and team members who may be different than them. The language we use goes a long way to help us break down barriers. It is a critical tool in communicating that we recognize what people are going through and we value what their identity means to them. The first is assigned and the latter two usually come to us through exploration and life experience, and can be fluid.
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.
As a proud bisexual man, for years I've had to navigate the complicated gray area that my identity occupies on the sexuality spectrum. Despite all of the gains the LGBT community has made, bisexuals are still looked upon with confusion — or outright scorn — by gays, lesbians, and straight people alike. From people asking me if I was "full-blown gay yet" to others questioning my motivations, I've probably heard it all. Unfortunately, the binary thinking of those who deny bisexuality's existence ultimately oppresses everyone by perpetuating unflinching standards of identity, whether they be heteronormative or homonormative.