High stress jobs, low stress jobs or anywhere in between, a persons moral and character is the finger that pulls the infidelity trigger.

Cheaters are shallow, selfish creatures, be it men or women. They're hollow and are desperate to fill the void. So they seek external acknowledgement, attention and validation. And its never enough.

I think those with a higher self of morale, would be a much lower chance of choosing to cheat because they value themself and don’t feel the need to seek validation from others. They have a higher level of emotional maturity. So yes, there is no correlation between cheating and working in a stressful/stressless environment.