These people will have dates on a regular basis, and they may or may not be having sexual relations.
The bride should get to stand out on her wedding day, and one of the ways she does that is by being the only one wearing white.
However, it's true that tradition ain't what it used to be, and not all brides wear white.
The pictures of 66-year old TV presenter Andrew Neil at his recent wedding show him proudly wearing a new ring on the third finger of his left hand.
It seems to have become the fashion for married men to wear wedding rings, but why do they do it?
And in the days when unmarried mothers were stigmatized, a wedding ring and a ‘Mrs’ title were important signs of respectability.