Guys - Do You Only Smile At Girls You Find Attractive?

So let's say you're at a public place and make eye contact with a girl and smile at her (obviously both appear to be single).

Do you only smile at her if you find her attractive? Or is it a normal friendly thing to do for you?

Do you think much of it if a girl smiles at you?
Guys - Do You Only Smile At Girls You Find Attractive?
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