Women may well account for 37% of accidents, but the statistics show that their claims are usually low speed imapcts (ie reversing into walls, clipping parked vehicles, etc).
Working for a well known womens insurers, I can conclude this is generally correct - us blokes (me included) have a tendency to completely wreck our cars and anything else in our way when involved in an accident. The last insurer I worked for, I dealt with taxi, commercial, and modified car policies - yep, predominantly male, so I speak from experience.
So yes, granted taking women drivers off the road would theoreticaly reduce accidents by 37%, but the cost of claims wouldn't significantly reduce as men tend to be the one's who kill and injure other drivers more often.