When I worked in the UK the staff had a saying "When you go away it stays away" ie never grass your mates up for their flings. I was appalled by this. Surely if a man/woman is fed up in the marriage and looking for relations outside of it, then it's time to finish.
And I would see them in bars chatting up members of the opposite sex, telling them they are single and getting what they want. A few also got more than they wanted and a few trip to the clinic !
One guy passed away and at his funeral we discovered he had a family in the UK and another in Ireland. What a mess !

I am a decent guy and I love my wife. I'll never cheat on her as I'm not weak.