How do you know if he feels the sexual tension too?

Anonymous
There's a guy who looks/stares at me a lot. And whenever he does, I feel like this kind of connection/tension/spark between us. It's like my heart skips a beat and then as I walk away I can't stop smiling. How do I know if this isn't all in my head because I have a crush on him and that he feels it too? We haven't really talked yet, just been introduced.
How do you know if he feels the sexual tension too?
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