Girls, what's one thing you all have in common which men should know?

Growing up I used to hear very ignorant stuff that puts all women in one baskit. But then only in GAG that you can recognise the tremendous variation..

But to make things easier for guys dating, what would you say something, or at least one thing, which you can say is all women have in common in regards to relationship with men?
Girls, what's one thing you all have in common which men should know?
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