Why is finding a unicorn so hard?
Three main reasons: (1) bisexual single women in the lifestyle are vastly outnumbered by couples seeking them, so demand exceeds supply by orders of magnitude; (2) many couples treat the unicorn as a "bonus" to their relationship rather than a person with her own needs, which the community has learned to spot and avoid; (3) one-rule arrangements (no contact outside of joint play, no developing feelings) often feel constraining to a single person who is meeting two new people at once. Couples who succeed usually offer flexibility, respect, and treat the unicorn as a guest, not a fantasy fulfillment.