Jack stares at him for a moment, and then grins. There's absolutely no condemnation in it. He may have learned a lot through having lived a long time, but he's never been particularly academic either, and in any case this particular slip is kind of cute.
"That's Monopoly. Monogamy is only having one partner at a time. Being faithful to just one person." He smiles ruefully. "It's not something I was brought up to believe in."