My Great-Aunt and her second husband had this marital arrangement........ (they didn't date, the marriage was more or less arranged by Elders not wanting a single mother to mar their KH image- married after only knowing each other two months)
When he died, no one offered condolences to her rather "his" pioneer, she took back her maiden name within a week too....
She married 'her' widowed pioneer the next month.......(happy together until his death 5 years later)
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Personally I think emotional affairs are devastating.....but that is only because I love my husband and would be devasted.
However when I consider two people who would normally divorce and mutually acknowledge the 'overness' of their oft arranged or lust-only based relationship....... and both agree on this course..... than whom am I to judge.
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.....granted everybody develops levels of emotional attachements in close working conditions....
Admittedly on harmless levels out of routine dependence, I have been office wife to many and my husband too has had office wives who schedule, fetch and otherwise assure smooth running of adminstrative needs.
We are all social creatures and all of us 'click' better with some over others....