I have heard the female genitalia referred to as a Man in a boat,(how sexist is that!) And the rowing is a very back and forward sort of movement isn't it?. Trimming the sails would sortof fit in with the anatomy also. Another song I have wondered about whether it is as innocent as it seems is the nursery rhyme "I had a little nut tree" The silver nutmeg and golden Pear sound similar to fruits bourne at either end of the male member. Now wonder the King of spains daughter travelled such a long way! Maybe I'm just obsessed!