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That was an explanation of the line - it's worked for me. It means, if you don't ask, you don't get. Why go through all the bullshit of coming up with a "line" that everybody knows sounds ridiculous. If she's going to fuck you, she'll fuck you despite a corny line, and if she's not going to fuck you, then no line in the world is going to help you. So just say what you mean, and cut to the chase.