Conversation so far:
Did Havelock Ellis write any books about sexual impulse?
Havelock Ellis' 1933 book is one of the many manifestations of his interest in human sexuality.
What was the name of Havelock Ellis's 1933 book?
Havelock Ellis' 1933 book, Psychology of Sex, is one of the many manifestations of his interest in human sexuality.

Question: What did he say in the book?
Self-contained rewrite: What did Havelock Ellis say in the book Psychology of Sex?