Polyfi has way too much gray area in the sense that 100 people could be in a Polyfi relationship of pansexual genders. The word monogamy has as much of a scale as polyamory in my opinion.
"I want one female and one male partner. My partner wants the same. If we get together we are bi monogamous meaning having or desiring only one lover of each gender."
In order to actually be in love with both partners I think you would need to be polyamorous so it becomes more of a dynamic description than a nature description.
Playing the Game of Life with Monopoly rules.
Monogamy might just be in my genes
Poly Events All Over