Norwegian scientists derived a simple formula for the strength of marriage - that was in pairs. where spouses share the household work, the risk of divorce is much higher than in couples where the entire household is in the statement of women.
The difference in the number of divorces between couples is 50 percent. The pattern was straight - the more housework performed by man himself, the more the marriage was falling apart. In the modern world women and men are equal in the level of education and earnings, fewer women are financially dependent on men, so they are easier for divorce.
It is noteworthy that women in families with a traditional way were not less satisfied with their situation than women with modern separation of duties.