One interesting thing about the book is that it was published by Eugenics Publishing Company, Inc. in New York, a company I have not been able to find any information about, but which seems to have published quite a variety of books up through at least the 1940s, though a quick Google search didn't turn up the full texts of any other than the one I already have. (Though there are some interesting items in Project Gutenberg's file of books with the same Library of Congress category.)
I'm currently working on a paper about sexology and popular culture in the 1920s and 1950s, so could go on and on about this entire subject, but I'll spare you and instead pass on one interesting passage among many from the book--
For ages, the whole situation has been left in a condition of most deplorable, not to say damnable, ignorance; and no honest endeavor has been made to find out and act up to the truth in the premises. Husbands and wives have engaged in coitus ad libitum, utterly regardless of whether it was right or wrong for them to do so! They have taken it for granted that marriage conferred on them the right to have sexual intercourse whenever they chose, (especially when the man chose,) and they have acted accordingly. This is especially true of men, and the practice has been carried to such length that the right of a man to engage in coitus with his wife has been established by law, and the wife who refuses to yield this "right" to her husband can be divorced by him, if she persists in such way of living! It is such a fact as this which caused Mr. Bernard Shaw to write: "Marriage is the most licentious institution in all the world." And he might rightfully have added "it is also the most brutal," though it is an insult to the brute to say it that way, for brutes are never guilty of coitus under compulsion. But a husband can force his wife to submit to his sexual embraces, and she has no legal right to say him nay! This doesn't seem quite right, does it?