Why do guys like seeing a girl put on lipstick/Chapstick?

oolala18
I was driving to work while putting on lip balm and the guy next to me was staring, even did a double take. It was dark out so there wasn't much that could've attracted his attention. So the question remains, what's up with guys liking when a woman applies lip stick?
Why do guys like seeing a girl put on lipstick/Chapstick?
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