Dating or Relationship??

It seems to me that everytime a college couple moves from dating to being in a relationship... the romance dwindles. It recently happened to a friend of mine...and now that I think about it... it happened with my boyfriend and I, too. The more I think about it, the more I understand it. When you're dating someone, there are no rules, no expectations- just two people enjoying each other's company. Now when you actually put a title on your relationship, such as girlfriend and boyfriend, tension starts to arise. The couple has more expectations of one another and they feel as if they have authority of one another, too. And when that happens- the arguing begins!!

So, I'm curious- why don't couples just date instead of putting a title on their relationship? Why ruin the fun??