John,
There are some interesting interpretations to the title of your thread.
One: "What I Tell You Three Times is True" has origins in advertising, which simply has to do with saturation. The other was given to me by, I think, Thorman on the Realm. He indicated that when a couple appeared in public three times, this was the indication that it was a serious situation, and marriage was impending. I simply cannot remember the specific culture in which this was a practice.
Sorry I can't think of a more earthy response. (flipping through "found under Carnal Knowledge" pages)