When girls make a move in public to flaunt their ass. What process went inside of her. Did she found the guy attractive?

This girl, like many other, whose boyfriend was walking behind her and me behind him. She somehow came back so that I can see her ass. She did this move deliberately. Does she only offered to flaunt her items or she expected more of it. What to do when they make a move to flaunt you deliberately in public.
When girls make a move in public to flaunt their ass. What process went inside of her. Did she found the guy attractive?
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