Should the temperature of an unconcious person be taken orally since they aren't moving about?

Taking the temperature orally with a glass thermometer, when the patient is unconscious is risky, as the patient may suddenly wake up and bite and break the thermometer. Apart from the glass splinters, a Mercury thermometer is a great hazard. The temperature could be more safely taken from the armpit, or anus, with less risk. Nowadays, most hospitals take temperatures using electronic devices that are placed into or near the external part of the ear, or are clipped to the finger and registered onto a computer like console.