There's also specific pressure creating cultural conformity; if you need to go to your mother in law when your husband is an asshole, you and your mother in law

There's also specific pressure creating cultural conformity; if you need to go to your mother in law when your husband is an asshole, you and your mother in law had better agree on what being an asshole is and how he should change. This creates a bias towards cultural stability but also limits unions involving social outsiders or non-traditional marriage partners.