Marriage law refers to the legal requirements that determine the validity of a marriage, and which vary considerably among countries. Marriage law refers to the legal requirements that determine the validity of a marriage, and which vary considerably among countries. A marriage, by definition, bestows rights and obligations on the married parties, and sometimes on relatives as well, being the sole mechanism for the creation of affinal ties (in-laws). Over 2.3 million weddings take place in the U.S each year. This means they take a vow to be faithful and committed to one another. Historically, many societies have given sets of rights and obligations to husbands that have been very different from the sets of rights and obligations given to wives. In particular, the control of marital property, inheritance rights, and the right to dictate the activities of children of the marriage, have typically been given to male marital partners (for more details see coverture and marital power). However, these practices were curtailed to a great deal in many countries, especially Western countries, in the twentieth century, and more modern statutes tend to define the rights and duties of a spouse without reference to gender. In various marriage laws around the world, however, the husband continues to have authority; for instance the Civil Code of Iran states at Article 1105: 'In relations between husband and wife; the position of the head of the family is the exclusive right of the husband'. These rights and obligations vary considerably among legal systems, societies, and groups within a society, and may include: