With the Thanksgiving season around, issues of gratitude come to the forefront.  I got to thinking a bit about the issue of a man being thanked for chivalry.  Is it mandatory on the part of the woman?  Desirable?  Helpful?  What should a gentleman do if thanks are not offered?  

I was recently interviewed on a BBC radio program hosted by popular host Graham Torrington, dealing with the issue of chivalry and whether it's dead. 
Graham mentioned that if he holds the door for a woman and she doesn't acknowledge the gesture he will sometimes call after her and say something to the effect of "the word you're looking for is 'thank you.' "