Nuer
The Nuer people of Southern Sudan require the groom to pay 20 to 40 cows for his bride. The marriage proceedings are not complete until the woman is able to deliver two children.
Once a third child is born of the union, the marriage is officially tied. The Nuer people believe in continuity and kinship, so the more a wife can produce for her husband, the more respect she garners as a role player in clan continuity.
If the wife is able to produce only one child after a given time frame, the husband may ask for a divorce. The conditions of the divorce are for the groom to either get cattle from the bride’s family or custody of the child.