Worrying news for anyone whose marriage seems a conflict-free zone: a lack of shouting matches doesn't mean all is smooth sailing, it could actually be a sign you're drifting apart.
A three-year study of 40,000 British couples by the Marriage Foundation revealed 80 per cent of couples who split or divorced had reported they were "generally happy" just 12 months earlier. In fact, only 13 per cent of relationships failed because of a period of high conflict or severe unhappiness.
"Abrupt ends to a marriage, violence and arguments are less likely than slowly growing apart," agrees divorce lawyer Marilyn Stowe. "It's a more subtle form of breakdown, where the intimacy ... slowly erodes."
London-based couples counsellor Carole Nyman believes a truly happy marriage is a nebulous concept: "It's normal to have disagreements, arguments, areas of sensitivity - all couples have them. This is life."
Avoiding disagreements is a sure-fire route to developing what Nyman calls "lumpy carpet syndrome" - where issues are not addressed, only to accumulate over time.