What do violent criminals look for in a female victim?

When I was getting my CJ degree, I took a lot of classes in crime, and law enforcement. One study our instructor taught us about studied how violent criminals pick a female victim. The study was done by interviewing men who were serving terms in prison for violent crimes against women who were strangers to them. How did they pick a victim? According to this study, the first consideration was height, then weight, then hair length. Men who attack women, or kidnap them, look for a woman who is about a foot shorter than they are, slim and with long hair. In order to control a victim, it helps if they are smaller and not so heavy they can't be moved easily. Long hair is something the predator can grab onto in order to better control the victim. Beyond that, they notice how well the victim is aware of her surroundings and how alert she seems.