I read about a study once, that said women tend to be more attracted to masculine features while they're ovulating and fertile, and the rest of the month they want a more delicate face. If you're scruffy, your bristles will wear her face raw when you make out. Other than that, glasses or a five-o-clock shadow won't affect the way women perceive you as much as your mannerisms, confidence, and how much fun you are.