"Bisexual" is an invented word preferred by the many deviant sodomists who lack the courage to accept that the invented word "homosexual" blanket-covers [No pun intended] who they are and what they do!
I couldn’t have said it better, my favorite pretend word/phrase is “homosexual sex” which doesn’t exist either, it’s sodomy. By definition, there is no reference to exclusivity for the tendency to direct sexual desire toward another of the same sex. “Bisexuals” practice perversion, plan and simple.