Wife swap: why it's never easy when two ex-couples switch partners

When two ex-couples switch partners, it’s never easy. Slipping into each other’s roles, and beds, brings more baggage. Here’s a word of advice for happy couples: stay away from other happy couples, particularly ones who share the same lifestyle, bank balance or level of attractiveness as you and your beloved, because it’s all too easy to get on famously, fall into each other’s arms and before you know it you’re swapping house keys.