ambisextrous vs switch-hitting

ambisextrous

adj

  • Bisexual. 

  • Epicene, androgynous. 

  • Having both male and female, or masculine and feminine elements. 

switch-hitting

adj

  • Bisexual. 

How often have the words ambisextrous and switch-hitting occurred in a corpus of books? (source: Google Ngram Viewer )