A specific genetic variant in men predicts lower levels of marital stability
A specific variation in the vasopressin receptor gene in men has been linked to lower marital stability and a 30% higher likelihood of experiencing relationship crises.
Genetic factors play a measurable role in male fidelity and marital success, specifically through the AVPR1A gene, which codes for vasopressin receptors. A landmark study of Swedish twins found that men carrying a specific 'short' allele of this gene were 30% more likely to have experienced a marital crisis or divorce. Vasopressin is a hormone that, in other mammals like voles, is directly responsible for territoriality and mate-guarding after mating.
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