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Published 14:40 13 Jul 2018 BST
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The more value a couple places on physical attraction also means the more likely it is the union will end in divorce.
"Reporting that one’s partner’s looks were important in the decision to marry is significantly associated with shorter marriage duration," Mialon told The Independent.
Spending money on a post-wedding holiday is worthwhile, though, according to the survey.
Going on honeymoon is "significantly associated with a lower hazard of divorce," the researchers found.
The latest statistics show that Irish couples spend an average of €26,015 on their weddings.
The average spend on an engagement ring is €1,849 while couples drop €5,261 on average on their honeymoon.
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