A person who has the capacity to form enduring physical, romantic and/or emotional attractions to those of the same gender or to those of another gender. People may experience this attraction in differing ways and degrees over their lifetime. Bisexual people need not have had specific sexual experiences to be bisexual; in fact, they need not have had any sexual experience at all to identify as bisexual.
REFERENCE: GLAAD Media Reference Guide – 9th Edition