The key to a happy marriage? A really good ROW: Study finds couples who argue are more likely to have a good relationship (just don't mention sex)

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Arguing really is the key to a happy marriage, according to new research -   but only if couples choose their battles wisely.

A study by teams at the University of Tennessee at Knoxville found that those in happier relationships all bickered with each other,  but chose to avoid the more difficult subjects, including sex. 

Researchers say it adds to evidence couples who argue together, stay together. 

The latest findings, published in the journal Family Process, were based on 121 couples in their 30s and 70s who had been happily married for an average of nine and 42 years, respectively. 

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One study found they are ten times more likely to have a good marriage than those who sweep things under the carpet.

Another found one in two couples say clearing the air once a week is the secret to their success - as long as they are mild spats and not abusive rows.

Study lead author Professor Amy Rauer, of the University of Tennessee at Knoxville, explained: 'Happy couples tend to take a solution oriented approach, and this is clear even in the topics that they choose to discuss.' 

They were asked to rank their issues with various aspects of their relationships. 

Intimacy was found to be of upmost importance for older couples, followed by leisure, household, health, communication and money.

Both groups rated jealousy, religion and family as the least important. 

When discussing marital problems, they all focused on clearer solutions - such as the distribution of household labour and how to spend leisure time.

They rarely chose to argue about things that are more difficult to resolve - suggesting this strategic decision is behind their marital success, said the researchers.

Professor Rauer, director of the relationships and development lab in the College of Education, Health and Human Sciences, said: 'Focusing on the perpetual, more-difficult-to-solve problems may undermine partners' confidence in the relationship.'

The study also found focusing first on more solvable problems may be an effective way to build up both partners' sense of security in the relationship.

Professor Rauer said: 'If couples feel they can work together to resolve their issues, it may give them the confidence to move on to tackling the more difficult issues.'

As to which issues may be more difficult to resolve, couples avoided discussing challenges regarding their spouse's health and physical intimacy.

They were asked to rank their issues with various aspects of their relationships. Intimacy was found to be of upmost importance for older couples, followed by leisure, household, health, communication and money 

These issues may be more difficult to address without challenging their partner's sense of competence or making the partner feel vulnerable or embarrassed, resulting in more conflict.

Professor Rauer said: 'Since these issues tend to be more difficult to resolve, they are more likely to lead to less marital happiness or the dissolution of the relationship, especially if couples have not banked up any previous successes solving other marital issues.'

The researchers also found couples who were married longer reported fewer serious issues and argued less overall.

This is consistent with previous research suggesting older partners' perceptions of spending less time with each other may lead them to prioritise marriage and decide some issues are not worth the argument.

In other words, couples may want to choose their battles wisely, according to Professor Rauer.

She added: 'Being able to successfully differentiate between issues that need to be resolved versus those that can be laid aside for now may be one of the keys to a long-lasting, happy relationship.'

Professor Rauer said conflict in marriage is inevitable. Even the happiest couples argue - and they tend to argue about the same topics as unhappy couples.

But it is the way they do it that may make a difference, said Professor Rauer.