Few things hamper a child as much as not having a father at home. “As a feminist, I didn’t want to believe it,” says Maria Kefalas, a sociologist who studies marriage and family issues and co-authored a seminal book on low-income mothers called Promises I Can Keep: Why Poor Women Put Motherhood Before Marriage. “Women always tell me, ‘I can be a mother and a father to a child,’ but it’s not true.” Growing up without a father has a deep psychological effect on a child. “The mom may not need that man,” Kefalas says, “but her children still do.”

—Caitlin Flanaga, Time magazine