How can a stare convey lust and attraction?

What does a particular stare communicate, such as: "I want you," "I'm interested in you," or "I want to date you"? It's like trying to make the first move without having spoken to each other. I'm curious about what kind of stare you would use to express this to her.
Is there a difference?
What would it mean if you just stare without saying or doing anything? Could you explain that kind of stare?
How can a stare convey lust and attraction?
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