A new study was published in the Proceedings of the National Academy of Sciences suggesting a genetic link to monogamy and marital satisfaction. Researchers found that men with 2 copies of the allele responsible for the distribution of vasopressin receptors in the brain were twice as likely to report marital dysfunction and to have considered divorce than those with one or no copies of the allele. They noted that human behaviour is determined by a number of factors besides genetic expression.
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