ejaculation vs menses

ejaculation

noun
  • A reflex in human beings and other mammals in response to sexual stimulation involving the forcible ejection from the urethra of, in males, semen; and, in females, vaginal fluid. 

  • The uttering of a short, sudden exclamation or prayer, or the exclamation or prayer uttered. 

  • The act of throwing or darting out with a sudden force and rapid flight. 

  • The act of ejecting or suddenly throwing, as a fluid from a duct or other body structure. 

menses

noun
  • The discharge of blood mixed with pieces of cellular tissue from the uterus out through the vagina, which occurs roughly every month in uninseminated women; menstrual flow. 

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