From what I understand, the reason why many men (CD'ers & non-CD'ers, alike) have some pretty nice legs, is due to the fact that we are typically carrying that much more weight, relatively speaking, on our *upper* bodies.
And yeah, you're gonna need muscle & bone density to support that.
Generally speaking, GG's typically don't have this "luxury."
And yeah, obviously there are some guys who have skinny little chicken-legs. So, it's not *all* men -- but many, anyway.