lesbian vs single-sex

lesbian

adj
  • Homosexual, gay; preferring mostly or exclusively women as romantic or sexual partners. 

  • Intended for lesbians. 

  • Between two or more women; homosexual, gay. 

noun
  • A homosexual woman, one who is mostly or exclusively sexually or romantically attracted to other women. 

  • A homosexual female animal. 

verb
  • To (cause to) take part in lesbian sex, or other lesbian activity. 

single-sex

adj
  • Suitable for, or restricted to, only one gender. 

How often have the words lesbian and single-sex occurred in a corpus of books? (source: Google Ngram Viewer )