If someone clearly states that they identify as bisexual, do not identify them as gay or lesbian instead.  Simply because a person is currently in a same-sex relationship, that does not negate one’s bisexual orientation.  Similarly, if a person is in what appears to be a heterosexual relationship, it does not negate one’s bisexual orientation… 

When writing about two people of the same sex in a relationship, consider referring to them as a same-sex couple.  Do not assume they are a gay couple or a lesbian couple until you know for certain that both people in the couple identify as gay or lesbian…

Often, when a notable person comes out as bisexual, they are referred to as an "ally" to the LGBT community.  This erases their sexual orientation, as it suggests they are not part of the LGBT community; leaving them to be seen as an outsider.  When a person comes out as bisexual, they should be referred to as part of the LGBT community…

it’s best to only use alternate words if someone specifically self-identifies that way and asks for their preferred term to be used.