Researchers have discovered what they believe is one around between for from in of over to the keys around between for from in of over to a happy marriage. A difference around between for from in of over to height around between for from in of over to the two partners could be a secret ingredient around between for from in of over to marital bliss. Professor Kitae Sohn of Konkuk University around between for from in of over to South Korea has discovered that the taller a woman's husband is, the happier she is. Mr Sohn said: "A greater height difference around between for from in of over to a couple was positively related to the wife's happiness." However, he said the attraction and benefits around between for from in of over to a woman having a tall husband do not last forever and diminish around between for from in of over to time. Sohn said the appeal around between for from in of over to a taller husband "gradually weakened over time". He said he was surprised to find that it took around between for from in of over to 18 years of marriage around between for from in of over to this appeal to disappear. Professor Sohn said he was intrigued as to why women seemed to prefer taller men. He said: "Although it has been known that women prefer tall men around between for from in of over to mating around between for from in of over to evolutionary reasons, no study has investigated whether a taller husband makes his wife happier." His study included analysing data around between for from in of over to 7,850 Indonesian women who expressed a preference around between for from in of over to taller men. The women said they did not know exactly why they preferred a taller mate. Sohn wrote: "Women simply like tall men, while unable to say why." He added: "This is similar to people favoring fatty, salty and sugary foods without knowing exactly why." However, the BBC noted that shorter men can be more stable, better husbands.