They leave the genitals off Barbie and Ken, but they manufacture every kind of war toy. Because sex is more threatening to us than aggression. There have been strict rules about sex since the beginning of written rules, and even before, if we can believe myth. I think that's because it's in sex that men feel most vulnerable. In war they can hype themselves up, or they have a weapon. Sex means being literally naked and exposing your feelings. And that's more terrifying to most men than the risk of dying while fighting a bear or a soldier.