When we joined the MLSC in the '70s there was some muddle about the nature of our family membership which meant that our daughter, then aged about 6 couldn't be a named member of the club. This was only an administrative point but our daughter received a long hand-written letter from Jack Corley explaining with regret that she would have to wait a year or two, but in any case in his experience girls made much better sailors than boys.
Actually, both our son and daughter can sail perfectly well and I wouldn't draw a line between them on this matter, though I caught our daughter out last year. She had volunteered to me her ability to tie a bowline with ease, apropos nothing in particular. A short time later she was helping me put the sails on and it became necessary to attach the jib sheets to the sail with bowlines, not the best way, I know. In order to do this, with the sail on the furler, it was necessary for her to reach above her head and tie the lines to the cringle, something that she found somewhat challenging, and I had plenty of time to take some incriminating photographs, which I won't further embarrass her by displaying.