men, how do you feel about a woman being aggressive?

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if you try to get with a woman and you get her number, never call, because there's a possibilty you don't know what to say, so you endup bumping into the girl, she asks why you never called her and your really not sure, should she ask you out if she's feeling you, should she always intiate everything, or she she just not get involved with him. i would like some opinions from some men, and women...feel free to be honest by the way, they've been out a couple of times, now...but is it okay to be aggressive with him or not...like calling, and asking to go out or stay in?