Use of Nikah-e-Mut'a

The Nikah-e-Mut'a is used in Shiah School in various ways (See: http://www.answering-ansar.org/answers/mutah/en/chap4.php):

• A person who is away from his homeland for a period of time and away from his wife etc. but he still has his human nature (i.e. lust). In this condition marriage is not suited for him and he cannot restrain his desires. So what does the Shariayah (Jurisprudence) say regarding these circumstances? Well its option is to do Nikah for a stipulated time or the other alternative is to commit adultery or fornication.
• It is especially useful in the modern times when many people move from one place to another, like from one country to another. Thus students, workers, scholars are allowed to fulfill their sexual and emotional needs if they are in another country. It may lead to permanent marriage afterwards.
• In some countries the law says a non-naturalized citizen cannot marry a woman and take her back to his country. In this circumstance if Mut'a is performed, after the set period both the man and the woman are free, from each other. If marriage is commenced then the couple are tied with other for the rest of their lives, or they will get tangled in achieving a divorce.
• Islam is a religion that is suited for all nations and ages. Mut'a is a good example of that. In the western world adultery and fornication are common and openly performed. Mut'a is a way of protecting a person from committing these serious sins and vices.
• One of the benefits of Mut'a is that a couple who does Mut'a gets to understand each other better over that period of time. If all goes well, when the period of Mut'a is over they may engage in a permanent marriage. This could also be in a reverse case; if all does not go to plan then they may go their own ways after the limit of Mut'a. Rather than getting married and then having a divorce. Mut'a is a great way of overcoming this undesirable act (divorce).
• It may be used to satisfy one's sexual needs. There are no requirements of having a witness, a written contract or permission from authorities (Although some people might prefer to have completed the contract in the presence of a learned Muslim).
• May be used to become mahram “To whom women are not required veil themselves” with somebody they do not intend to cohabit with or have a married relationship with, but with whom they spend a lot of time (for example, share a house). In order to ease the hijab "modest dress" rules, they engage in a Nikah-e-Mut'a, writing in the marriage contract that no physical contact is allowed.
• Young unmarried couples may decide to use Nikah-e-Mut'a as an allowable alternative to zina. Thus in practice they engage in something very similar to western relations (that is, there is the potential of permanent marriage), but it differs in that there is a specified time as to how long the relationship is to last, with the possibility to prolong that period.
• Some divorced men and women, disillusioned with permanent marriage, prefer to only commit for a few years at a time.