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The scientists looked at DNA of monozygotic twins that flanks the vasopressin receptor. The researchers compared the genes in that area to men’s scores on the Partner Bonding Scale, which is designed to estimate the strength of a person’s attachment to his or her spouse or partner. They found that men with one version of the gene-called the “334” version-had low scores and were less likely to be married. The wives of those who were married were less satisfied with their marriage than women whose husbands did not have that genetic variant. The report in the Proceedings of the National Academy of Sciences stated that those with two copies of the gene were twice as likely to report having had a marital crisis in the past year.
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