"My love," he wrote "we are going to be apart for a very long time. Already I'm starting to miss you and there's really not much to do here in the evenings. Besides that we're constantly surrounded by young attractive native girls. Do you think if I had a hobby of some kind I would not tempted"?
So his wife sent him back a harmonica saying, "why don't you learn to play this"?
Eventually his tour of duty came to an end and he rushed back to his wife. "Darling" he said, "I can't wait to get you into bed so that we make passionate love"!!!
She kissed him and said, "First let's see you play that harmonica".