Car insurance for women?

So what does everyone think? The UK government has just allowed insurance companies to charge less car insurance to female drivers as objectively and statistically they have less accidents than male drivers. I used to think this was obvious; however a (female) friend pointed out that this would allow for any group to be discriminated for or against as long as statistics backed it up. I still like the idea, specially since it's the only objective back-up we have against men's subjective claim that women don't drive properly. Opinions requested!