You underestimate your fair lady if you think that her main gifts are her pretty face and long legs. There is definitely a lot more than meets the eye regarding almost all women in the world. In other words, a man is able to read women's thoughts only if he is hit by some miraculous lightning which, as we all know, happens only in science fictional comedy. Is it true that when a woman says 'no' it usually means 'yes'? If it really is so, is it stable or maybe there are exceptions? Taking into account the general notion of an uncertain and vague female soul, we can guess that there's nothing too certain or stable concerning women's mind...
Maybe is No

A man must always get the point regarding the issue that a woman's 'maybe' in his direction (as a reply to his desire to ask her out or date her i.e. become more than friend to her) in the majority of cases equals 'No'.
Of course, we could continue the intriguing story about a woman's mysterious soul being the main reason why women's 'maybe' to a man almost always equals 'no', however, we better tell you the truth here.
In reality, reasons why women sometimes answer 'maybe' instead of 'no' to men's desperate attempts to start a romantic relationship with them are quite logical and understandable. First and foremost, ladies are just reluctant to offend men's pride. Men are very sensitive, in certain issues they are even more sensitive than the fair sex. These issues imply romantic relationships, that's why if a man feels that a woman doesn't like him it offends him greatly, it hurts his pride and often makes him shut himself out from the world even.
There are situations when maybe-equals-no is a trick that females successfully use with their husbands in order to calm them down with the 'maybe' and act according to their own firm 'no' in the long run. The trick works in the majority of cases, just like any other female tricks and 'illogical' (but only at first sight) approach.