A third of those surveyed said affection was the key to keeping the spark alive.
Almost three in five couples think the secret to a good relationship is honesty and humour.
The two traits were ranked as the most important elements in a relationship, according to a survey of 1,000 people by One4All.
A third of those surveyed said affection was the key to keeping the spark alive while 13 percent said small gifts like buying flowers are important in making a relationship last.