Bisexual doesn't seem to be a very useful parameter. We need something better than the classic scale with straights on one end, gays on the other and bisexuals in the middle. An indiscriminate horndog may be bisexual but they have less in common with June Cleaver than a bisexual woman is is a faithfully married homemaker who changes a longtime partner of one sex for another. Is someone in prison who enters a same sex relationship after sex or companionship. Maybe how lonely they are is the important thing.
If one is the loneliest number and two can be as lonely as one then the set of all natural numbers are equally lonely. Your menage a trois can't save you. If one is the loneliest number that you ever knew than an unknown number is the optimum solution. Quit counting and start partying.