It isn't really a case of "more fragile", but different body shapes, different center of gravity, and so on. Not to mention that if you are talking averages, th

It isn't really a case of "more fragile", but different body shapes, different center of gravity, and so on. Not to mention that if you are talking averages, the "average" test dummy could easily be built taller, with more muscle mass and a bit less regular fat (even at healthy weights) than the average woman is simply because men would tip the scale a bit upwards. I imagine these things cause differences in the way folks move in accidents. Airbags, for example: If breasts tend to get in the way, then the airbags aren't going to be as helpful for women or, alternatively, cause more harm to women simply because of breasts (I'm speculating the example, I don't know it to be true).