You live in a country were self-centredness is a sickness. That said, polyandry thrives, so I once more don't believe that. :)

Many men have multiple children with many different mothers. They spread their seed far and wide.

I think that we have been so socialized that it's difficult not to be influenced by what we absorbed from our culture. I only know these things because in my twenties I studied anthropology at university, and, of course, I've traveled far and wide.