Discretion

https://commons.wikimedia.org/wiki/File:Looking_across_the_Cherwell_at_Parsons_Pleasure_(geograph_5379091).jpg
Image: Wikimedia Commons

A group of Oxford dons were sunbathing nude by the River Cherwell when a female student floated by in a punt.

Most of them scrambled to cover their nakedness, but Sir Maurice Bowra instead put a flannel over his head.

When asked why, he said, “I don’t know about you, gentlemen, but in Oxford I, at least, am known by my face.”