NEW YORK - American men still don't pull their weight when it comes to housework and child care, but collectively they're not the slackers they used to be. The average dad has gradually been getting better about picking himself up off the sofa and pitching in, according to a new report in which a psychologist suggests the payoff for doing more chores could be more sex.

The report, released Thursday by the Council on Contemporary Families, summarizes several recent studies on family dynamics. One found that men's contribution to housework had doubled over the past four decades; another found they tripled the time spent on child care over that span.

"More couples are sharing family tasks than ever before, and the movement toward sharing has been especially significant for full-time dual-earner couples," the report says. "Men and women may not be fully equal yet, but the rules of the game have been profoundly and irreversibly changed."