Devil's advocate here, but is having a long term partner without the paperwork really any different than a legal marriage?
Even if you don't live in a state that recognizes common law marriage and even if you have managed to keep your finances completely separate and do not legally co-own property, etc. If you have kids, aren't the social and emotional effects of the relationship breaking down the same whether you're legally married or not?
I think we get hung up on the term "divorce" too much. The bottom line is the problems we are talking about stem from a relationship breaking down . This idea that the way to cut down on divorces is to never get married is silly. There is very little difference between a legally married couple breaking up and a live-in long term relationship breaking up. Just more paperwork. The emotional and financial effects on any children and former partners are the same. In fact, the effects on children and former partners, not always but often women, of non-married former couples may be worse. Without that legal paperwork in place one of the partners, again often the woman but not always, is often left with no legal recourse for things like alimony or a fair share of equity in the home, etc. In many ways being a long term, non married partner is far riskier for women than actually getting married.