Nursing profession is a calling, just like NUNS. These people always attend to patients in critical conditions as well as stable conditions. The psychological torture they go through make them lose interest in bedroom matters, which is why they are cold in bed.
It is also reported that Nurses, on duty, befriend doctors. So-when the husband is warming the bed alone, the nurse is warming a room in hospital alongside her “lover”, doctor. Sometimes-I have witnessed before-some nurses sleep with patients.