Well, some cultures have inheritance that passes from a man to his sister's children. The cultural stability is maintained within the genetic family of origin rather than through the sexual pair bond. I think I actually read that if you consider human beings as an animal species we are middle of the road in terms of polygamy/ monogamy. Other species, a lot of birds for example, pair-bond much more strongly. There's actually a lot of natural variation on this trait amongst primates. Gorillas, chimpanzees and bonobos all function very differently. I think bonobos have sex all the time with everyone and never mate excusively. It's like a handshake in their society.
Also, let's face it, pair-bonding has a lot to do with social hierarchy. I was reading the Savage Love column recently and there was a guy who wrote in saying that he was strongly sexually attracted to heavy-set trailer trash looking women but he was married to a thin fit woman. He felt like he couldn't marry the kind of woman he wanted to have sex with but he didn't want to have sex with the woman to whom he was married.
IMO, since women are more strongly given the assignment by our culture to choose mates for purposes of pair-bonding over sex, more women end up being LD in their relationships. I think a good part of the reason that I am HD is that my FOO dynamics for reasons both good and bad were such that I have always been inclined to choose men for sexual reasons over pair-bonding reasons. Put on some leather and play a guitar if you want to get me into bed. I don't care about your credit rating, I've got my own to worry about, but the flowers you brought will make me smile and want to bake you a cake.
"Tell me, what is it you plan to do with your one wild and precious life?" - Mary Oliver
