"Married Love" is one of the most famous 'sex education' manuals. First published in 1918, it sold tens of thousands of copies, and was one of the first publications to openly discuss issues such as variations in male and female sexual desire in a form which could be easily read and understood by the ordinary reader. This is the 6th, revised and expanded, edition, from 1919. The main text is mostly unchanged. An appendix has been added with some extra information on subjects such as sex during pregnancy. (Summary by Archive.org.)