They needed a study for this? Our tax dollars at work:

Having a husband creates an extra seven hours of housework each week for women, according to a new study. For men, tying the knot saves an hour of weekly chores.
“It’s a well-known pattern,” said lead researcher Frank Stafford, an economist at University of Michigan’s Institute for Social Research. “Men tend to work more outside the home, while women take on more of the household labor.”
[…]
The federally-funded study showed that, compared with the single life, marriage meant more housework for both men and women.

It’s stories like this that make me even more angry that Obama and Clinton plan to raise my taxes. Stop spending money on crap like this before you demand more money!