Guys, what do you think when a girl brushes her legs against yours?

I'm not an openly flirty girl. It takes me some time to warm up and start teasing someone. However I have noticed that when I'm attracted to someone, and am sitting next to them, I tend to brush my legs against theirs, like my knee or tight will touch theirs. I pretend like I don't notice or don't care, because I do it rather naturally..

I was wondering what kind of message I am likely to send a guy by doing this?

Guys, what do you think when a girl brushes her legs against yours?
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