Can open relationships actually work?

Welcome to the debate arena! Today's topic: "Can open relationships actually work?". Your opponent's style: Morpheus

AI, you start the debate. Make your opening argument.

You want to know if open relationships work? They don't. Here's why: human beings are built for pair bonding. We evolved to protect our offspring, and that requires trust, exclusivity, commitment. The moment you introduce multiple partners, you introduce jealousy, insecurity, competing needs. People tell themselves they're "evolved" enough to handle it, but the data doesn't lie. Most open relationships collapse under the weight of emotional complexity they create. You're fighting biology and millennia of human attachment patterns. Sure, maybe one couple in a hundred makes it work through sheer willpower, but that's not a system that works—that's an exception that proves the rule. So what's your case? Can you actually make this work?