So, a little advice. Relax. You're not filling a job position. You're looking for a pleasant acquaintance.. who might become a good friend... who turns out to be attractive to your senses... and a rewarding lover... then a committed partner whose heart will not stray. If you don't see those signposts and in that order, then you're probably on the wrong road and getting more lost with every step.
It's a false premise to say that most monogamous people have chosen monogamy. Most people belong to the religion they were raised in...because that's what's familiar. That's the milieu they grew up in, and, for better or worse, they're just continuing the pattern. Until this traditionalist mindset is shaken loose, you would likely try from reflex to impose notions onto nonmonogamy that are not only untenable in the new context but spel sudden and messy doom even in situations that otherwise could be worked out.