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Interesting subject. I always make eye contact when talking to someone. Used to know a person who prefered to look at my chest instead of my eyes when talking to me. It seemed weird to me, but there must have been a reason.
I always try to maintain eye contact, whenever possible, and yes, the sunglasses have to come off or I'm not interested in the conversation at all. Some people do avoid eye contact and shuffle around a fair bit, no idea why..