i know from men who work in not jewish/not frum offices. the last thing they want is a flirting secretary. yes, eventually she’ll find out you’re a married men. but why bother dealing with that – even if it’s for a week. or a day. and they’re constantly meeting new people. it’s so much easier to have it clear by wearing a wedding band. it’s takne for granted that a married man always wears a ring to work. that’s just how it is.
so yeah, if a guy’s a rebbie he won’t need it.