Males with a specific vasopressin receptor gene polymorphism are less responsive to vasopressin and more likely to be divorced or unmarried.

“So there's a particular variety of this polymorphism in the vasopressin receptors that males have that make them less responsive to vasopressin. These males are more likely to be either divorced or never been married, whereas males that don't have this polymorphism are more likely to be happily married.”