Vote ONE, for premarital cohabitation!
Marriage or Living together
I vote for living together IF you are old enough to have your head on straight and MOVE OUT if it isn't a good relationship.
I think some young people have a hard time leaving once they have moved in, even if things are bad. It almost becomes a marriage to them when it really isn't.
But if you are mature, if you can stand on your own two feet, if you know who you are and have an idea of where you are going in life, then living together is a good thing before marriage. If you are not, you should be careful of serious relationships altogether...you probably are not ready.