I give my personal thoughts on temporary marriage (called sigheh in Farsi or mut’a in Arabic) at the GOATMILK blog:
I support any way that two consenting adults can safely get it on. And so I don’t think sigheh marriage (temporary marriage also referred to as mut’a, or pleasure, marriage) is a bad idea.
In a magical, lollipop-and-rainbows land.
But in the reality where we all live? No. It’s a terrible idea.