A girl I know at work married someone she had only dated for about 4 months...on the outside it looks ok, it's a mess in reality. I think she was just dying to get married, because a bunch of her friends recently did and she felt left out, plus she has a very loud biological clock. They've finally been together for a year(married only since this past August), but it's just not a good situation at all...more problems than you can shake a stick at.
To each their own, but a year minimum in my book...then at least you are semi out of the infatuation stage and know what it's like to be together when it's not all hot and heavy. Reality sets in...and sometimes reality is a good thing. I think the above girl had she had gotten to know him better would have had second thoughts at this point.