OK, so your mom was right.
It turns out that moving in with that special someone without getting married first puts you at very high risk for an unplanned pregnancy.
That's one of the key findings of a new report from the Guttmacher Institute.
The report found that overall, "the United States did not make progress toward its goal of reducing unintended pregnancy between 2001 and 2006." In fact, the rate was 49 percent in 2006, virtually unchanged from 48 percent in 2001.