Very good question.
Women with their heads down, are not paying attention to their surroundings. Women who do not make eye contact, are less likely to fight off an attacker. Women with their hair in a pony tail can be easily over taken. Women wearing high hills are also a target more so then one who is wearing tennis shoes. Women with their purse tucked under their arm vs. over their shoulder are an easier target. Women who smile at strangers are less likely to be attacked because, they are confident enough in themselves to make eye contact and actually smile. However they are more likely to be approached by the homeless or someone who is trying to hustle them. You must always make a stranger fully aware of your personal space the moment it appears that they could even approach you.
Ladies, take yourself to the local "Army Surplus" Store. They sell these awesome key chains that can be used as an effective weapon in hand to hand combat. In the event you are ever attacked keep a cool head and don't panic, and FIGHT, FIGHT, FIGHT.
Just like wolves, a predator looks for an easy target.
Don't be their easy target.
I refuse to be a victim!