Dear Prudence,
Is it OK for an adult to suck her thumb at work? I work for a small company and the new receptionist, an attractive, bright woman of about 20, sucks her thumb almost continuously when she's not talking. When I come out to meet my clients, there she is sucking her thumb in front of them. Her direct supervisor sits close to her and would have to be blind not to notice. I’ve almost said, “Stop sucking your thumb!” but I haven’t. I'm a go-along-to-get-along type of guy, but this embarrasses me for her, my clients, and the business. What should I do?