Mrs. Don-o, please believe I hold you in the highest respect. Nonetheless, you need to understand we're not talking "couples" here. This is a situation where a woman will give birth-Oh, forget it!-bear a litter of ten children with ten different sperm donors. This is a deliberate demographic invasion. Remove the incentive and the problem resolves itself.
Whatever their motivation structure may be.
Some people actually expect to get their most durable human satisfaction and security from their kids and not from their 40l(k). That's why I like the one "family planning" method which works without the aid or interference of anybody else on earth.