If the bisexual chooses her as her mate, she will braid ribbons into the lesbian’s hair, no matter how short. This feat can only be accomplished by bisexual women. This is also why bisexual women always carry ribbon with them at all times.
i.e. If a bisexual is attempting to flirt with some individual of unidentified orientation, they are guaranteed to guess the wrong one. On the other hand, if they are watching happily married actors on TV, they will be 100% spot-on, every time.