Also, I don't have the time to find a scientific study on nipple stimulation leading to milk production. I probably won't have time to look for sometime. But to me, the fact that a woman can produce milk in response to her husbands passionate kissing of the breasts leads me to believe that the milk was also made for the husband during times when there are no children. It is also very difficult for a baby with a non-pregnant women to cause her to lactate as a baby will get upset and give up if no milk is produced from the suckling.
Only the husband who would kiss out of passion and devotion would get milk through this method.
This is the quickest articles I could find that aren't anecdotes.
http://www.wisegeek.org/how-can-i-induce-lactation.htm
My hunch is that it's real and a little known but major mechanism of breast function.