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I think it is a bias only if it is present in most humans. I can't see that in me (but maybe I'm biased :-o). Can it be that you have developed a special interest or attention or curiosity in this? I mean some predisposition for being interested in social intercourse is surely normal (wouldn't call that a bias). If it gets reinforced you might develop that into an individual bias.
I think it's present in at least a fairly high proportion of humans.