https://www.independent.co.uk/news/science/gene-marriage-success-relationship-dna-genetics-yale-university-a8802176.html
Citando:
"Some people have a gene linked with happy marriages, scientists find
'This study shows that how we feel in our close relationships is influenced by more than just our shared experiences with our partners'"
(...)
"People with this gene variant – known as the GG genotype – are already known to show greater empathy, sociability and emotional stability.
Given the kind of characteristics that might contribute to a happy and successful marriage, it is perhaps unsurprising that this was the stretch of DNA found frequently in content spouses."