"Nikāḥ mut‘ah" (Arabic: نكاح متعة) is a temporary marriage. There is controversy on the Islamic legality of this type of marriage, since Sunnis believe it was abrogated by Muhammad or Umar, while Shias do not hold this view. According to Shia Hadith: Ali (r) said ‘Had Umar not banned Mut’ah then the only person to fornicate would have been a disgraceful person, since Mut’ah is easy, and one can attain the objective, there would have then been no need to indulge in haraam acts. It is clear that if Mut’ah’s abrogation was Sahih then Jabir would not have opposed Omar, and that if Islamic prophet outlawed it, the Companions would not have practiced it during the reign of Abu Bakr. Someone asked Abdullah bin Umar (about Mut’ah) saying: ‘Your father prohibited it. (Ibn Umar replied): ‘Is the order of the Messenger of Allah, more deserving to be followed, or the order of my father?’ [http://www.shiapen.com/comprehensive/mutah/umar-banned-mutah.html].