Couple Seeks Unicorn
'Couple seeks unicorn' typically, not always, refers to a cis straight man and queer or bicurious woman searching for a bisexual woman for sex. A rarity, as Melissa A. Fabello writes for , "The joke is that the existence of such a woman is so elusive she may as well be a mythological creature."
To be clear, it’s OK to desire a threesome, it’s also no bad thing to want casual sex or even a triad. The situation gets dicey when a couple objectifies the third person, calling them ‘an anniversary gift’ or ‘treat’, and aren’t upfront about what they’re looking for, just ‘having fun’. For some couples, using more transactional language may distract from any fear or jealousy arising. But it also exacerbates couple privilege, which you want to be aware of to invite someone safely into your relationship. By the way, populating your profile with only pictures of the woman? Not cool either.
You can leave unsuspecting queers alone because there’s a better way to initiate a consensual, positive encounter. In my opinion, that starts with accepting you’re engaging in an act of consensual non-monogamy, however briefly, and getting informed about what that means.