Why did my girlfriend wipe her mouth after kissing me?

She wanted me to kiss her so I did and we eventually made out with each other for a while. She seemed like she really enjoyed it but when we were done she wiped her mouth when she thought I wasn't looking but I noticed it from the corner of my eye. I'm sure I didn't leave much saliva if at all around her lips.

Was that natural or was she turned off?
Why did my girlfriend wipe her mouth after kissing me?
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