In addition to the usual "women's songs like Fisherman's Wife and all those other "I'm so faithful as I pine away in sorrow for my man gone to sea" ballads, there are some pretty fun ones with female themes.
Most common of these is the "girl posing as boy" stuff like Handsome Cabin boy and the like.
There's even a group down in DC called Pyrates Royale (they even have a web page) that specializes in songs about... you guessed it: piracy. Anyway, their lead female singer does a female/pirate version of Plains of Mexico that starts with a line something like (and I quote from memory, so I'm probably off a bit, but you'll get the idea):
A woman's not allowed at sea
Heave away, Santianno
And so I turned to piracy
All off the coast of Mexico...
Well, you get the idea.