While a gay man might casually mention his husband, or a lesbian might out herself by talking about her girlfriend, bisexuals are often wrongly assumed to be straight or gay depending on who they are with. Spelling out that they are bisexual can be misconstrued as rejecting a current partner or declaring themselves up for anything.
Faith Cheltenham, president of the national bisexual organization BiNet USA, was often presumed to be lesbian when she dated women. When she met the man who would become her husband, she worried people would assume she was straight, invalidating the work she did to come out.
But when she tries to correct that assumption, some mistake it as a sexual invitation. They say, “Why would you tell me you’re bi when your husband is right there?” Cheltenham said."