The feeling of happiness a bisexual gets being in an mf relationship with another bisexual where not only do they get to mutual admire each other's bodies but can also mutual bond over a shared admiration and lust for dicks and pussies
Jim: You know I love how when I show you videos of girls rubbing themselves you get more horny then jealous. Truly euphoria knowing we can bond over that
Sally: More than euphoric it is biphoria. I also love the bulge you get when I describe the cocks I have sucked and how you say you would have joined me for it.
Jim: Hey nothing more biphoric then mutual lusting