Chris Ford of the University of Bristol, one of Dr Farrow's co-authors, speculates that by preventing ovulation and the stresses that it puts on the reproductive system, Pill-using women may, in effect, be cheating time.

ECONOMIST: The Pill

Cheating on refrigeration time sometimes pays off.

NPR: Pursuit of the Perfect Christmas Cookie

Half the time, cheating partners are found out through indiscreet mobile phone text messages, one in five are betrayed by emails, and only one out of 10 are given away by the traditional, anonymous letter.

FORBES: Can Adultery Cure the Winter Blues?