fence sitter vs switch-hitter

fence sitter

noun
  • One who is bisexual, or who is uncertain about their sexual orientation. 

  • One who takes neither side of an argument or controversy, but maintains a neutral position. 

switch-hitter

noun
  • A person who has sex with both male and female sexual partners. 

  • A batsman who performs switch-hits. 

  • A person who can bat either as a right-hander or a left-hander. 

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