lecher: [12] Etymologically, a lecher is a ‘licker’. English borrowed the word from Old French lecheor, a derivative of the verb lechier ‘lick’, which was used figuratively for ‘live a life of debauchery’. This in turn came from Frankish *likkōn, a descendant of the same prehistoric Germanic source as English lick [OE]. The inspiration of the metaphor, which originally encompassed the pleasures of the table as well as of the bed, was presumably the tongue as an organ of sensual gratification. => lick
