Biologically, I think that there are always going to be more single mothers than single fathers. Women can get pregnant without knowing who the father is. Altho

Biologically, I think that there are always going to be more single mothers than single fathers. Women can get pregnant without knowing who the father is. Although formula exists today, men could not feed young babies very well for most of history. These social structures are probably intended to serve a greater number of people, so they serve women better than men.