The letter 'was couched in' polite terms.
a psychiatrist's 'couch'
(..) Would you stay and watch the game with me? Maybe have a slice of pizza? - Of course l will. - l can braid your hair. l know the couch isn't very deep, but we could move the back cushion and spoon. Hey, you guys, what do you say? Beer and chips in the back. Just ignore them. (..)2001 TvShow: Scrubs Title: My Mentor Season: 1 Episode 2