If a coworker occasionally touches my shoulder briefly, can it be a sign that he is attracted to me?

Anonymous
Occasionally one of my colleagues touches my arm or shoulder during a conversation. Never in an inappropriate way. Also, he smiles at me a lot. Does this mean anything, or he is just too friendly/touchy-feely? ).
If a coworker occasionally touches my shoulder briefly, can it be a sign that he is attracted to me?
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