Every child has both a mother and a father, and there are about as many men as women, so the mean number of children is about the same for males as for females. But there are more childless men than childless women, because polygyny is more common than polyandry, ultimately because of Bateman’s principle.
Every child has both a mother and a father, and there are about as many men as women, so the mean number of children is about the same for males as for females. But there are more childless men than childless women, because polygyny is more common than polyandry, ultimately because of Bateman’s principle.