Try it...see if it works, then say no. You don't get women by being "nice" (which is actually a misnomer since when people say "nice guys" it rarely actually is describing a desirable human being).
Let me illustrate; why do you think when you have a girlfriend all of the sudden you are that much more attractive. It's because you are, in effect, making yourself unavailable and therefore showing active disinterest in other women. Therefore you become a challenge and set yourself apart from every other guy in the club, bar, school, workplace. Or as Jag pointed out in another thread "wait until you're married"...the ultimate unavailability (I guess outside of death...although that doesn't really count, I hope).
Now think of this phenomenon from the "nice guy's" perspective. To the "nice guy" any man who is not doting on a woman is in effect, an ass...so why the hell would she be wasting her time with him. Because he is not going "out of his way" (although in some cases the way he is acting is intentional) to get her, this illustrates confidence. I don't need you because I am independent and confident without you. The nice guy, on the otherhand...who most likely showers her with attention (giving her a major rash)...appears dependent on her acceptance of him, therefore driving her more away.
