In a recent study, couples cohabitating in the U.S. are on the rise and now account for 52% of all out-of-wedlock births. This is growing increasingly similar to trends in Europe, where babies of cohabitating parents make up around 66% of out-of-wedlock births and even higher rates in parts of Scandinavia.

How do out-of-wedlock babies affect couples who are living together, but not yet married?