It's another in a long list of things that Martians hardly ever think about: Almost any woman knows that almost any man is stronger than she is. Oh, men know they're stronger, but they seldom actually stop to think through the implications of that simple reality--implications that are both unnerving and virtually omnipresent, if you aren't a Martian. You think about life differently when you know that half the people you see have the physical power to do things to you, regardless of whether you intend to allow it--and even implied threats of physical violence have to be taken seriously.