In 1972, sociologist Jessie Bernard looked at symptoms of anxiety, depression, neurosis and passivity in married and unmarried people. She found that men were better off married than single, and concluded that they got those benefits at the expense of women. That became a central tenet of the women's liberation movement in the 1970s, and is still often cited.

But psychologist David de Vaus from La Trobe University in Melbourne points out that Bernard's research only looked at a narrow definition of stress. "It is well known that women are much more likely to score highly on those disorders," he says. Most research has ignored the fact that mental disorder can manifest itself in men in the form of drug and alcohol abuse, de Vaus claims.

De Vaus looked at data from 10,641 adults ...