With the aid of a personal communicator, the driver is alerted if there's a stranger in the car, before getting in. The car can actually detect a heartbeat.
Volvo claims this is but one piece of technology that stems from the YCC experiment a couple of years ago. They've been good to their word, incorporating ideas from women into future vehicles. And it's interesting to note companies like Ford and GM, who previously pooh-poohed the idea, are all hot and heavy on the female driver topic.