There was a time in history when the wealth of a true African man was determined by the size of his flock and household. The higher the number of children; the richer the man was. More children meant more workers to tend on his expansive farm or the ever growing number of sheep, goats and cows.
Even the good book supports this school of thought as David, the much-loved king of Israel, wrote in Psalms 127:3-5 which reads in part "blessed is the man whose quiver is full of them (children)."