Found this in an old note book, My translation of Pablo Neruda's Soneto I. Below you will find an explanation of all the dirtier parts of the poem.
Matilde, nombre de planta o piedra o vino,
de lo que nace de la tierra y dura,
palabra en cuyo crecimiento amanece,
en cuyo estío estalla la luz de los limones.
En ese nombre corren navíos de madera
rodeados por enjambres de fuego azul marino,
y esas letras son el agua de un río
que desemboca en mi corazón calcinado.
Oh nombre descubierto bajo una enredadera
como la puerta de un túnel desconocido
que comunica con la fragancia del mundo!
Oh invádeme con tu boca abrasadora,
indágame, si quieres, con tus ojos nocturnos,
pero en tu nombre déjame navegar y dormir.
1. "Crecimiento amanece" could be translates to "rising development' or "rising erection".
2. In Spanish, "Limones" is slang for breast.
3. I think "St. Elmo's fire" represents "Blue veins of erect penises" because St. Elmo's fire is usually found around the yardarms of ships, and the "yardarm" of a ship in Spanish is called "la Verga" which translate to penis, which to me means that the "wooden flotilla" are the many erections the name "Matilde" caused.
4. "Enredadera" is either vines, or "morning glories". Matilde was a redhead. "Morning glories", which I feel represents Matilde's red pubic hair, are sometimes red, and grow on vines. I think after that the tunnel (vagina) and "bouquet" are obvious.
5. He already implied in the third stanza that "Oh name" meant "vagina", and the word "Navegar" means navigate, or to follow/run a course. Course in Spanish translates to "fluir", which means gush, or spew (ejaculate).
I also have a feeling the in the first line "plant", "stone", and "wine" represent, respectively, pubis, clitoris, and vaginal secretions.