I am thinking we are not understanding what you are trying to say or ask.
Is it that you ask about the loss of sex between a man and wife? Sex does not make a marriage. Marriage can refer to the relationship or connection between a man and woman. Sometimes it just refers to the legal status of a man and woman's relationship.
You have two kinds of relationships in west. One is marriage and the other is living together without marriage. I was aking - Will the woman would react differently if she was not legally married?
