Rules of Marriage or Nikah
    The
      relation between man and woman becomes lawful by contracting marriage.
      There are two kinds of marriages: Permanent marriage and fixed-time
      marriage. In permanent marriage, the period of matrimony is not fixed, and
      it is forever. The woman with whom such a marriage is concluded is called
      Da’ima. In a fixed-time marriage, the period of matrimony is fixed, for
      example, matrimonial relation is contracted with a woman for an hour, or a
      day, or a month, or a year, or more. This sort of fixed-time marriage is
      called Mut’ah or Sigha.