Mathematicians have proved what women have been counseling their friends for years: a woman increases her chances of getting a "good" man by not sleeping with a partner straight away. They used a numerical model to show that better partners were willing to date for a longer time before having sex, but "bad" men were more reluctant to hang around.

Who would have thought?

http://www.independent.co.uk/news/science/mathematicians-guide-to-firstdate-etiquette-1418240.html