Temporary Marriage (muta) is forbidden in Islam!
In this short article we will see how and why Temporary Marriage was first allowed in Islam, but then later was forbidden by our Prophet peace be upon him:
"Rabi' b. Sabra reported that his father went on an expedition with Allah's Messenger (may peace be upon him) during the Victory of Mecca, and we stayed there for fifteen days (i. e. for thirteen full days and a day and a night), and Allah's Messenger (may peace be upon him) permitted us to contract temporary marriage with women. So I and another person of my tribe went out, and I was more handsome than he, whereas he was almost ugly. Each one of us had a cloaks, My cloak was worn out, whereas the cloak of my cousin was quite new. As we reached the lower or the upper side of Mecca, we came across a young woman like a young smart long-necked she-camel. We said: Is it possible that one of us may contract temporary marriage with you? She said: What will you give me as a dower? Each one of us spread his cloak. She began to cast a glance on both the persons. My companion also looked at her when she was casting a glance at her side and he said: This cloak of his is worn out, whereas my cloak is quite new. She, however, said twice or thrice: There is no harm in (accepting) this cloak (the old one). So I contracted temporary marriage with her, and I did not come out (of this) until Allah's Messenger (may peace be upon him) declared it forbidden. (Translation of Sahih Muslim, Book 8, Number 3253)"
Narrated 'Ali: "I said to Ibn 'Abbas, 'During the battle of Khaibar the Prophet forbade (Nikah) Al-Mut'a [Temporary Marriage in English] and the eating of donkey's meat.' (Translation of Sahih Bukhari, Wedlock, Marriage (Nikaah), Volume 7, Book 62, Number 50)"
Narrated Jabir bin 'Abdullah and Salama bin Al-Akwa': "While we were in an army, Allah's Apostle came to us and said, "You have been allowed to do the Mut'a (marriage), so do it." Salama bin Al-Akwa' said: Allah's Apostle's said, "If a man and a woman agree (to marry temporarily), their marriage should last for three nights, and if they like to continue, they can do so; and if they want to separate, they can do so." I do not know whether that was only for us or for all the people in general. Abu Abdullah (Al-Bukhari) said: 'Ali made it clear that the Prophet said, "The Mut'a marriage has been cancelled (made unlawful)." (Translation of Sahih Bukhari, Wedlock, Marriage (Nikaah), Volume 7, Book 62, Number 52)"
Narrated Saburah ibn Ma'bad al-Juhani: "The Apostle of Allah (peace_be_upon_him) prohibited temporary marriage with women. (Translation of Sunan Abu-Dawud, Marriage (Kitab Al-Nikah), Book 11, Number 2068)"
The reason why temporary marriage was allowed is to prevent illegal sex, prostitution and rape especially during the early times of Islam when Muslims didn't have residence stability and were facing all kinds of difficulties from the pagans. The Muslim men used to also travel for long months away from their families to meet the enemy in the battle field. Some of the towns they used to go to had Muslim women in them, and like I said, to prevent adultery and fornication with any woman (Muslim or non-Muslim), and to prevent rape, the Prophet peace be upon him allowed temporary marriage contracts between Muslim men and women.
When the Muslim state became stable during our Prophet's time, he then forbade that act because Muslims then could get married and have stable lives with their families and raise Children in a stable and convenient community.
http://www.answering-christianity.co...y_marriage.htm