But even if that hadn't happened, we do read much about the strife between the children of the different wives, up to murder. Well, if the man is not a Chrstian husband or one who doesn't know what God tells Christian husbands in regard to how they treat their wives then that might in rare cases even be so. But if a man loves his wife as God tells him to, then there is no reason for the wife to be lonely. Now she has to share his attention with yet another woman. And in most African societies women are not confined to their hut, as many Muslim women are confined to their home.
African women do have much more a social life in the village community.
If she needs social interaction, she sure can have that with the neighbor's wife without having to share now her huband on top if it. If feel tempted to ask some of my African friends about this. It sounds really bogus to me. I do not have the book, but maybe I should get it. After all it is the theory YOU want to propagate.