Are girls aware if their bodies are touching with a guy?

I'm in college and we were on the bus. It wasn't too crowded, but a girl and I were standing close. Our legs, arms, and our sides were pressed on each other. We were both standing and holding on to a ledge.

I apologized to her because there wasn't too much room for me, but she didn't say much. She smiled.

But I was wondering if she noticed that our bodies were touching together or if she didn't mind...

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Does this mean the girl was interested in me?
Are girls aware if their bodies are touching with a guy?
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