It was reported this week that women fib more than men. Four out of five females said they lied every day compared to two out of five men, and some women said they lied up to 30 times a day.If 80 percent of women lie every day, then you'd have to be an idiot to have "she said it so I believe it" as your default position. This, of course, is why women are so much better at seeing through other women than men are. Being liars themselves, they know when other women are lying.
Even those who aren't habitual liars are surrounded by them and are aware, as few men are, that dishonesty is the default position. The important thing to remember is that it's not really whether she lies or not that is the issue, but rather, how she lies. The way in which a woman lies can, in many cases, be more informative than the simple truth.
This also means it is foolish to get upset with a woman about lying. Try to think of it as "defensive communication" rather than shameless dishonesty. At an instinctual level, women are afraid of men, and when they are worried that they will make a man angry, their instinct is to lie in order to avoid trouble.
It's not necessarily a bad thing, although obviously it can be tremendously abused. Only a fool or a madman wants to know the complete truth about another individual, of either sex, anyhow.