We really do follow the preconceptions of our partners.  For the British and Americans, we are almost always female, because that is what a ship is.  Continental Europe is far more complicated though.  While civilian ships are usually female, most fighting ships are male.  I think it may be because they didn’t live at sea like the English.  Whatever the reason though, few Europeans think of warships as female, so most of us who join them choose to be male.