Google Ngrams

A new service by Google allows readers to follow the rise and fall of concepts across 5 million books and 500 years. When you enter one or several phrases into the Google Books Ngram Viewer, it displays a graph showing how those phrases have occurred in a corpus of books (e.g., “American English”, "British English", "English Fiction", "German", “Spanish” etc.) over the selected years. You can refine your search by clicking on various shorter periods listed below the graph. Within these shorter periods, you will get lists of the actual works examined. Of course, one has to understand the limitations of this unique offer, and one has to be careful in interpreting the graphs. Nevertheless, they can be of some help to those who are interested in the historical dimensions of scientific topics. For the purpose of illustration, we are providing a few samples in English to go with some of our online courses:

Sigmund Freud, Wilhelm Reich, Havelock Ellis, Magnus Hirschfeld, Alfred Kinsey (English)
2. Sigmund Freud, Wilhelm Reich, Havelock Ellis, Magnus Hirschfeld, Alfred Kinsey (German)
sexology, sex therapy, sex education
4. sex research, sexual science, sex survey
5. sexual behavior
6. monogamy, polygamy, polygyny, polyandry, group marriage
7. female prostitution, male prostitution
8. sexual health, sexual rights
9. feminism, women's movement, women's liberation, women's rights
10. equal rights, women's rights, women's movement, feminism
11. minority rights, women's rights, children's rights, sexual rights
sexual perversion, sexual deviation, paraphilia
13. paraphilia, pedophilia, hebephilia
14. male sexual response, female sexual response, premature ejaculation,
female orgasmic dysfunction
15. hyposexuality, hypersexuality, sex addiction
contraception, birth control, abortion
17. male circumcision, female circumcision, female genital mutilation
transvestism, transsexualism, intersexuality, transgender
19. gender dysphoria, gender identity disorder, transgender
20. Harry Benjamin, Christine Jorgensen
sexual minorities, transvestites, sadomasochists, fetishists
22. homosexuals, gay men, lesbians
23. homosexuality, bisexuality
24. sexual orientation, sexual preference
25. gay liberation, gay rights, gay marriage, homophobia

etc., etc., etc. ...