The claim that wives perform massive amounts of "unpaid work" appears frequently, most recently in a New York Times article sympathetic to the claim, and in a thread here challenging the claim.

Over a century ago, the playwright August Strindberg wrote a refutation of the "unpaid work" claim:

http://www.readbookonline.net/readOnLine/11657/

He also wrote other material critical of marriage from the male point of view:

http://www.readbookonline.net/readOnLine/11658/

http://www.readbookonline.net/title/38537/

http://www.readbookonline.net/stories/Strindberg/430/

For his troubles, he has been lambasted as a misogynist ever since - and the "unpaid work" claim persists, a century later!