Guys: if a woman smiles at you, what is your first thought and instinct?

I noticed that every time smile at guys, I always get very different reactions. Some are very shy, some don’t know what to do, then there are some guys that act very extroverted. But in general, guys seem confused or surprised, why though, what is the first thought and instinct that comes to you as a man?
Guys: if a woman smiles at you, what is your first thought and instinct?
Guys: if a woman smiles at you, what is your first thought and instinct?
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