My view is it is in the wiring. I am male, so you know my bias. I met my wife who owned and raced her Tarten 10 and she happen to have it docked next to my boat. Over the years I have wondered the very same. I have spent much time training juniors both boys and girls to race etc. I have watched the girls do really well and then not so well. I would ask why the poor performance and the response from the girl was so the boys would still like me. Yes, terrible but true. I believe that most women have other goals and dreams. Sure women can do just as well as men, they just do not happen to want to right now...In many situations the women tend to value a relationship more than steering a boat. Can they? Sure, but why when they can get men to do anything they want...My wife and I raced all types of boats however it is very difficult for two hands to steer the same boat. I encourage my wife to race our boat as much as she wants and yes it becomes very strained when I am on the boat in a race. Why? Because I want to win the race...she is still interested in the relationship thing..leads to shorts and faulty wiring...Good luck to the answers of life such as this... but I think the big reason may be those women sailors got married...
Respectfully submitted and one who has been beaten many a time by women skippers (P Glaser comes to mind)
Rich