Why is what I'm presenting "arbitary"? It's a lot of the same stuff that was in that story you linked me. Sarah Hrdy is a highly esteemed anthroplogist and sociobiologist and it speaks to the current trend in anthropology that reconizes cooperative breeding as the most likely type of social organization for our early ancestors. The rest points to the biology of all animals, and the specifics of human genital function. It's incredibly relevant and on-point to this topic.

I've looked at, researched and written about this topic from a wide variety of subject matter areas. The picture that it paints is the one that I have presented. And you haven't actually demonstrated anything different that counters it. Come back with something substantive and we'll talk more.