are humans meant to be monogamous?

An unplanned ramble of all of my current thoughts regarding monogamy. I love ambiguous topics that can simply never reach an absolute conclusion. Are we meant to be monogamous? How do we separate romantic and platonic intimacy? Why are the rules of monogamy so gendered? Were our ancestors monogamous or is it a modern invention of convenience? I'm not sure, but listen to hear some of my deliberations thus far.