TheTaco007 said:
And do you REALLY want to wait until you're married? A: Why the hell would you? (Again, biased Atheist here)
Waiting till you're married isn't just a religious thing. Its proven that having a monogamous relationship and having sex within marriage drastically reduces your chance of STI's and the like.
I think waiting till marriage is best, but if you find someone you love and want to share that experience with, then why not? If you're really happy and its a good relationship, I think it kind of acts as a reminder of how happy you were at that time/ still are.
Personally I believe it is important, and not something you should just give to anyone. I think promise rings are good if you don't wear it when its convenient for you. If you wear it out of devotion or faith, good for you. Don't wear it just to look cool then take it off when your friends start making fun of you, then its just pointless.