Equal Haircuts For All?

Jonathan Evans mediates a debate going on in Denmark:

You see, the Danes fancy themselves especially advanced when it comes to matters of gender equality, and the country’s Board of Equal Treatment recently found that salons and barber shops charging different prices for men’s and women’s cuts are violating Danish law. The hairdressers and barbers, for their part, argue that the disparity is completely reasonable, because it tends to take longer to cut and style women’s hair. Some have suggested charging different rates for long, medium, and short hair as a fix, but others say that’s too open to interpretation.

We say, why not charge according to the total amount of time the cut takes?