Why do a lot of married people NOT wear their rings?

I'm at work today in a meeting, surrounded by many people whom I know are married- men and women alike. I notice I'm the only one wearing my wedding band (tells you how exciting this meeting was). I also see this trend elsewhere

I wear my wedding band all the time except when I'm sleeping. I only remove it when working on machinery or rotating parts.

Why?

Why do a lot of married people NOT wear their rings?
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