Is flirting a personality trait?

Do you know any flirts that don't notice when they're flirting? It's just how they initiate conversation or act normally? Do you really have to try to be a flirt or does it come naturally? I don't know how better to ask this question. But I've been called a flirt for a while and never could find out why friends would call me a flirt. I've been this way since high school, just outgoing and cheery.
Is flirting a personality trait?
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