I can only assume sexual favours at this point, becasue I find it baffling also.
There's someone on here who works for an insurance company who might be able to answer that. Does seem utterly ridiculous but no doubt it will be down to the fact that statistics still show that men who include women with poor driving histories still have fewer accidents.
I find insurance absolutely baffling. Firing off quotes, they'll insure me for a grand less on a brand new S3/R32 than a second hand one. Stats must show young drivers in brand new high performance cars are much less likely to crash. Still makes no sense to me.