A small favour from the doctor

A patient is about to be released from hospital after recovering from an obscure infection. At the last check-up he asks his doctor "Would you do me a favour? Would you tell my wife if she doesn't suck me off each day, I'll die?" The doctor says "Sure, I can do that... " so the doctor proceeds to invite the wife into his office for a talk. When the wife comes out of the office, the patient asks her "What did the doctor say???" with a grin on his face The wife said "He said you'll be dead by midnight"...