[konaice]

"The breakup rate of cohabiting couples is considerably higher" than that of married couples, Popenoe said.

And he would know this HOW?

There is no record, and no statistics on this. It stands to reason, but the only way it could be discerned is by extensive research on children's records (noteing different names and addresses for each parent) but most of these records are still protected.

[Indy Pendance]

If they even have children.