Awwwww.....

From the Bride's Book of Etiquette:

Why does the ceremony end with a kiss? From the days of ancient Rome, the kiss was a legal bond that sealed contracts, and thus, the betrothal. Christianity incorporated the betrothal ceremony into the marriage ritual. It is also believed that when a couple kissed, part of each of their souls was left behind in the other when their breath was exchanged. Occurring at the end of the rites, the kiss announces a new status.