The only problem I see here is if said women can't support their children. The idea of one mate for life for a human being is Asinine and runs against our genetic predispositions. There have been many societies where group marriage or Polyandry has been practiced not to mention communal societies that raise kids as a communal responsibility. Essentially that is what's happening here in a roundabout way. You can concoct all the crazy religious non-sense you want (Abrahamic Religions and the like) to suppress Human sexuality but, it will have its say. It will be expressed. What they should do is a study based on access to common sense sex education and birth control or based on Religiosity of the household. From that we might learn something.