blue-balling vs love-shy

blue-balling

adj

  • Sexually frustrated. 

love-shy

adj

  • Ineffectual at courtship or attaining sexual intercourse. 

noun

  • A person, especially a man, who is ineffectual at courtship. 

How often have the words blue-balling and love-shy occurred in a corpus of books? (source: Google Ngram Viewer )