1. Infidelity is not as common as one might think, for a 2006 online survey of 46,000 people revealed that one in five married men and one in ten married women had committed infidelity during their marriage (BBC's UK Lovemap).

2. In case there is no chance that your partner will find out about a one-off misdemeanour on a business trip, and you want your relationship to survive, honesty is not necessarily the best policy.