For me, it all depends on which buttons get pushed and for how long. Certain buttons+longer time=wet, wet, wet. But if a guy doesn't give me the kind of foreplay I need, then it's not gonna happen. Personally, fingering doesn't get me off. Perhaps you ought to try some other methods of foreplay--massage, stroking other areas of her body like the insides of her thighs, more attention to her breasts, etc. The best thing you could do, though, would be to ask her what works for her. Most likely, she knows.
As Toaster said, we're all different.