Being raised in a single-parent household, especially when a woman is head of household, puts you at higher risk for all sorts of negative personal outcomes, right? If that data is all you know, yes. But as they say, correlation does not equal causation. But the assumptions of causation come out in the responses of people to these social statistics; conservatives often want to maintain stability in the home, put the father there because the father is critical. Many liberals will focus on the economic outcomes of single motherhood, and argue that buffering the family against fiscal stress through government programs will have a palliative effect. Both of these are environmental theories. Perhaps the father has some direct impact as a role model an a source of stability. Or perhaps the presence of two parents, one of whom one is generally the father, fosters economic health. Or, perhaps it's the genes? Associations Between Father Absence and Age of First Sexual Intercourse: