In addition to its modern sense, in Middle English 'queynte' also = 'cunt
For, certeyn, olde dotard, by youre leve,
Ye shul have queynte right ynogh at eve.
Is it for ye wolde have my queynte allone?
, The Wife of Bath's Prologue
As clerkes ben ful subtile and ful queynte;
And prively he caughte hire by the queynte
Geoffrey Chaucer, The Miller's Tale
The usage in Chaucer is clearly vulgar: the word occurs not in the poet's own voice but in the monologues of two of his most plain-speaking characters, the Miller and the Wife of Bath.