In the name of Allah the most Beneficient the most Merciful.
The concept of Mutah is very delicate as well as detailed ; and that is the reson we find that some people who are Ignorant about the concept of Mutah start criticizing it ,without knowing its real benefit.
It should be noted that Mutah is accepted by Islam and prooved from Quraan.
Here i will try to brief abt Mutah.
What is Mut'ah?
Mut'ah is a type of marriage, used in the same way as a permanent marriage (Nikah) in order to make a man and woman physically halaal to each other. A Mut'ah is a temporary marriage that ends at a fixed period.
How is Mut'ah Contracted?
The contracting of Mut'ah is just like that of Nikah, both require specific words to make the contract halaal - both types of marriage have Dower. The difference between Mut'ah and standard Nikah is that there is no specified time scale, whilst a time scale is necessary with Mut'ah. Mut'ah has many Shari'ah rules / regulations if one wishes to learn further they should consult Shi'a books of fiqh.
What is the position of children born from Mut'ah?
There is no difference between the children of Nikah or Mut'ah. Both are considered legitimate under the Shari'ah - they inherit from their parents, and all Islamic laws apply with regards to paternity.
Qur'anic Evidences for the Legitimacy of Mut'ah
The Verse of Mut'ah (4:24)
The most important verse of the Holy Qur'an which establishes the legitimacy of Mut'ah is verse 24 of Surat an-Nisa, known to all hadeeth commentators (Sunni and Shi'a) as "the verse of Mut'ah." This verse provides a clear and unshakeable permission for the practice of temporary marriage. In the same way that Islam has established principles to protect human beings, via rules and regulations, it has at the same time provided for legitimate means by which man can enjoy himself, and Mut'ah is one of these ways. The Shari'ah prohibits fornication, but at the same time allows the practise of Mut'ah. If anyone is unaware of this blessing from Allah (swt), then let us set out the evidences from the Holy Qur'an:
"[Forbidden to you] are married woman, except what your right hand possesses. This Allah has written for you, and all other women besides these are permitted to you, so that you may seek them out with your wealth, seeking chastity and not fornication. So when you have contracted temporary marriage [istimt'atum] with them, then give them their words. There is no sin on you for whatever you agree to after this. Indeed, Allah is Knowing, Wise."Al-Qur'an, Surah An-Nisa, Ayah 24.
Benefit of Mut'ah
Before commenting further i just want to ask tht If mut'ah was in any kind of immorality then why did Allah SWT allowed it ??
One of the main problems in all debates surrounding the legitimacy of Mut'ah is the degree to which people's minds have been clouded on this issue. If one goes into a debate believing that temporary marriage is fundamentally immoral, than it will be impossible for such a person to accept the Qur'anic and hadeeth proofs for its legitimacy. Such a person has already closed off his mind to the truth, and no amount of Islamic evidence will be able to sway him. A critical issue which needs to be dealt with, then, is whether or not Mut'ah constitutes a moral outrage, or whether
(as the Prophet and Imams 
have taught) Mut'ah is a blessing and grace (lutf) given by Allah (swt) to the believers.
(again it is a vast discussion , i will brief)
To know more about mut'ah and its benefits and practical examples of sucessful people who performed mutah in these recent times, view the following website
http://www.al-islam.org/encyclopedia/chapter6a/7.html
It should be noted'
The Shari'ah does not force people to practise Mut'ah, rather Mut'ah is a means via which couples prevent themselves from fornicating, and there is no distinguishing between rich and poor on this. . Mut'ah can be practised according to the circumstances that a man or women find themselves in,
if people do not like it, then they can refrain from it, after all there is no religious obligation on all believers to practise Mut'ah , it is an available option for anyone who deems it necessary'.
Among many of the benefits of Mut'ah is that a couple who do Mut'ah get to understand each other better over that period of time and that is what we call engagement nowadays. If all goes well, when the period of Mut'ah 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'ah. Rather then getting married and then having a divorce Mut'ah is a great way of overcoming this undesirable act (divorce).
There are yet many details of Mutah and its benefits and many more, but i think (not to make the document too long) this information may suffice for the time being to get the idea about Muta'h and its Legitimacy and benefit and so on.
! MURTAZA !
Watch 'The Mukhtar Narrative / Mukhtar Nama' on Ask - a series narrating Mukhtar al-Thaqafi's revenge for Karbala.
- By BatoolM