In one of my old works places it would`ve been easier to list who was cheating, rather than who wasn`t.
One boss was carrying on with his mates missus - the girl worked in our building, his mate didn`t.
Another boss was carrying on with one of the girls in our office ( both married )
Another boss ( long standing partner ) used to pick off all the new girls when they came into the office.
Another two of the married lads had very long standing mistresses and used to go on holiday with them.
A lad ( married ) was carrying on with a girl he worked with ( both married )
The mad thing is it was seen as completely normal.
Our work dos where the stuff of legend lol