bikini vs sluggos

bikini

noun
  • A brief bathing suit worn by men. 

  • A brief two-piece bathing suit worn by girls and women, especially one that exposes the midriff and navel. 

sluggos

noun
  • A type of men's swimming briefs where the bulge of the genitals is noticeable. 

How often have the words bikini and sluggos occurred in a corpus of books? (source: Google Ngram Viewer )