Girls, how important is flirting when getting your attention from a guy?

Is there certain methods or things to say when a guy or man flirts with a female? I know every girl or woman is different. Sometimes sexual humour may be a sign of flirting where a girl laughs or be completely disgusted. A guy can say a witty line thats original and not weird to catch her attention. Is there anything girls or women can add?
Girls, how important is flirting when getting your attention from a guy?
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