Actually one of about 59 incentives in benefit programs and the tax code that provide perverse incentives for shacking up over marriage (or encourages long-married senior citizens to divorce on paper).
The communist goals have always been to break up families. Families are competition; as long as families are intact and capable of providing for themselves there will be no outcry for government to be their provider.
That’s why the communist-sympathizing organizations are always big on pornography, atheism, sex outside of marriage, abortion, homosexuality, promiscuity, divorce, drugs and alcohol, gambling, etc. Where those things abound, families are hurt and it helps communists create an inverted triangle, where the needy/takers far outnumber the self-sufficient/givers and topple the whole model of families providing for their own, under the burden of families providing for everybody else who blew their chances at a functioning, self-sustaining family because of bad choices.
This isn’t to say that everybody who is in need is in need because of their own bad choices. My sister-in-law is in dire financial need after her husband’s abuse largely due to porn addiction. She didn’t ask for that. But those who push porn succeeded in creating another family which cannot support itself. Obamacare doubly hurts because she can’t find a job.