Having dated women who were shaped like guitars, banjos, and mandolins, I'm not sure I relate to the "shape" issue.
I will say however that a promo photo of Peggy Seeger (with banjo) that I saw when I was 15, beat every "Playmate of the Month" hands down. On the other hand, Leadbelly (with guitar) did nothing for me. Likewise Joan Baez and Judy Collins.
Rick (who never dated anyone shaped like a Hammer Dulcimer)