Bisexual erasure is the tendency to ignore, remove, falsify, or reexplain evidence of bisexuality. In its most extreme form, bisexual erasure can include denying that bisexuality exists at all. It is considered a type of biphobia, although it does not necessarily involve overt antagonism.
People who engage in bisexual erasure may claim that bisexuals are either exclusively homosexual (gay/lesbian) or exclusively heterosexual (straight), that they are closeted gay or lesbian people who wish to appear heterosexual, or that they are heterosexuals or homosexuals who are simply "experimenting" with their sexuality rather than expressing a true and persistent orientation. A common form of bisexual erasure is the tendency for bisexuals to be referred to as heterosexual when they are intimately involved with people of the opposite sex, and to be labeled as homosexual when they are involved with people of the same sex, regardless of the orientation of their past relationships.