why are men and women so much different in attitudes?

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men are from mars and women are from venus is a good book . We cant live with the opposite sexes and neither can we live without them. Sometimes they amuse us and at times they frustrate us. we all have gone through the same experience and yet we dont know why men and women behave differently. here is your chance to know why men and women differently behave. so u respond yur opinions as to why do they behave differently