This is a stretch, but it just might be the origin of the word: vanilla
1662, from Sp. vainilla "vanilla plant," lit. "little pod," dim. of vaina "sheath," from L. vagina "sheath" (see vagina). So called from the shape of the pods. European discovery 1521 by Hernando Cortes' soldiers on reconnaissance in southeastern Mexico. Meaning "conventional, of ordinary sexual preferences" is 1970s, from notion of whiteness and the common choice of vanilla ice cream. Vanillin is from 1868.
the other OED