Fact: Bisexuality is real. It has always existed and it probably always will. To deny it is to deny history, the experiences of modern day people, and a good deal of we know about human sexuality.
I know WE are real because I am real and because I tried to deny that I was not straight for most of my life. In the 1990's, because of the Internet, I discovered that bisexuality exists an in an instant my whole being was explained and verified.