This time, however, the researchers administered a better-recognized measure for relationship satisfaction, and also administered a questionnaire aimed at capturing a dimension not studied in the first round: pickiness.

FORBES: Study: When Women are Fertile, Stable but Not-So-Sexy Guys Get the Shaft

Bridget Anderson of Oxford University's Centre on Migration, Policy and Society recalls receiving the results of a questionnaire administered to domestic employers in a number of different countries, which asked what the staff spent their time doing.

ECONOMIST: Domestic labour