Can marriage be considered a group?

Marriage fits many aspects of the definition of a group. It has a common identity (often symbolized by taking identical last names). Spouses interact frequently. They depend on each other.They work toward common goals, such as raising a family. They are often quite similar in many respects ranging from political and religious beliefs to intelligence and physical attractiveness. Yet they are also often different in many ways. Division of  labor is common in marriage: Traditionally,the wife took care of the home, made and repaired the clothes, tended the sick, and stored and cooked the food, while the man did the heavy farm work (or, later, earned most of the money), provided protection,and built or repaired the dwelling. Today,spousal roles continue to change and adapt, but most married couples still divide up their tasks in some ways. Groups share emotional experiences, and certainly marital love and sex would certainly count as such.