Often, it is women who for some reason do not care to put in that extra effort. It seems to bleed over into other areas often too, such as diet and exercise. I see a lot more cases of fat women who "go to the gym" than fat men, as they are going there only to put in a half hearted attempt at "working out" (i.e. doing very little effort on the elliptical).
Pic related to bad parking: women are so bad at parking it can be seen from space.