There is some truth to what Coco is saying about how men generalize visually attractive and outgoing women. However, it is also up to the mature and sensible woman to size up these men and make an educated decision about whether or not they get a shot at pursuing her.
I don't let guys get very far if they approach me drunk and stupid, try some stupid opening line (seriously, just say, "Hi"), or try some other tactical BS they read about in GQ. Make friendly conversation. Ask me why I'm going out tonight (maybe it's a friend's birthday, maybe I needed to blow off steam from work), offer to buy me a drink, pay me an original compliment.