Shared interests, a sense of humour and a healthy sex life may all go a long way to creating a satisfying marriage.
But when it comes to making a wife really happy, having a tall husband may be the key, according to a study.
Researchers found that the greater the height difference in a couple, the happier the wife was.
He added that the relationship between height and happiness ‘gradually weakened over time and entirely dissipated by 18 years of marital duration’.
Clears up so many mysteries... ;)