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I agree that it is tough to make generalizations about behavioral differences between males and females.  Granted we are different biologically and there many overlaps between social behavior.  But, couldn't we also make the argument for humans and dogs?  Again, humans and dogs are different biologically.  But, I bet some (mostly dog-lovers) would argue that we share many social behaviors with dogs.  I know this is a pretty crazy comparison, and it echoes Jean's point  below that defining boundaries is often difficult. But, I really think drawing lines sometimes is important.  Although there will always be exceptions when lines are drawn, I think it helps simplify things for many circumstances. 

I find it slightly demeaning to compare my behavior to a dog's.  Therefore, if we get rid of certain boundaries (like that for gender behavior), we may be crossing into a dangerous territory.