Why are women never straightforward?

Not to seem sexist or to demean women, but it's true, I have NEVER met a women who has said to me exactly what was on her mind (not to say that there aren't any who do). Past girlfriends and current female friends are never as honest, at least compared to my male friends. It shouldn't be that hard to just say what you think. Why are girls like this?
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Why are some women not straightforward with men they are comfortable to be around (for example a loving husband for x number of years)? Do they still fear of being judged negatively?
Why are women never straightforward?
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