"Enjoyment marriages" are regaining popularity in Iraq. The practice of arranging temporary unions has a long history among Shia Muslims, but was banned by Sunni Saddam.
According to Shiite religious law, a mutaa relationship can last for a few minutes or several years. A man can have an unlimited number of mutaa wives and a permanent wife at the same time. A woman can have only one husband at a time, permanent or temporary. No written contract or official ceremony is required in a mutaa. When the time limit ends, the man and woman go their separate ways with none of the messiness of a regular divorce.
Although the temporary arrangements are becoming more common, they are still controversial, and people usually conduct them secretly. [Link]