But, you are missing the point. The recipient doesn't know and shouldn't assume the number is correct or incorrect, just that it's what was offered. Your scenario assumes a correct number given, everytime, which is unrealistic. And, in the situation where a woman is just trying to get a guy to go away, puts her into further awkwardness. If she realizes what he's doing, it will just make the situation creepier and more uncomfortable for her. To be honest, as a man, I am amazed that we are having to point this out to a woman.