sexual abuse vs statutory rape

sexual abuse

noun
  • Any sexual activity that is undesired by one participant but forced on them nonetheless, especially when considered to be more sustained or frequent than an incident of sexual assault. 

statutory rape

noun
  • An illegal act of sexual intercourse by an adult with a person under the legal age of consent for sex, or with another adult who is not able to consent because of intellectual disability. 

How often have the words sexual abuse and statutory rape occurred in a corpus of books? (source: Google Ngram Viewer )