AH...the unicorn hunters, seeking the elusive, hot, bi babe to make all their poly dreams come true!
That naivete is kinda cute, actually. The odds of the each of them finding a good match in another partner aren't large ('cause poly folk don't grow on trees) and they think that finding a woman who will match both of them equally is more likely than that. It usually doesn't take long for them to grow out of the unicorn hunting phase.
Usually, the unicorn hunting is a sign that the couple doesn't have realistic expectations.