From what I recall having read, there are health improvements, financial improvements, having two parents is much better for raising children (from what I recal

From what I recall having read, there are health improvements, financial improvements, having two parents is much better for raising children (from what I recall this is independent of the gender of the two parents), and there are larger systematic issues when significant portions of the population have difficulty finding a relationship (look at the purposed roles polygamy plays in destabilizing the Middle East or the social costs of China's one child policy that strongly influence people to have a single boy now that a few decades have passed).