Sack tapping as flirting?

Ever sack tap as a form of flirting? Girls you ever do this to guys you're dating? Any guys ever date a girl like this? I guess I'm curious as to the what motivates the girl to do it ( in my case frequently).
Never did it to a guy/. No girl ever did it to me
Once in a while
Frequently as a form of play
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Sack tapping as flirting?
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