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.
What did Havelock Ellis say in the book Psychology of Sex?
In this book, Havelock Ellis goes into vivid detail of how children can experience sexuality differently in terms of time and intensity.
What age approximately did Havelock Ellis say that sexual impulse developed?
Havelock Ellis claims that sexual self-excitement is known to happen at an early age.
According to Havelock Ellis, who is more likely to experience sexual impulse, males or females?
However, Havelock Ellis claims that many people of both sexes can recall having agreeable sensations with the genitalia as a child.
According to Havelock Ellis, are all children able to experience pleasure?
Havelock Ellis asserts it is a mistake to assume all children are able to experience genital arousal or pleasurable erotic sensations.
What did Havelock Ellis conclude or find in his study?
Havelock Ellis concludes, then, that children are capable of a “wide range of genital and sexual aptitude”.
Is there any other interesting facts of Havelock Ellis you'd like to share?
Havelock Ellis' views of auto-eroticism were very comprehensive, including much more than masturbation.
Did Havelock Ellis reference any work in his studies?
Havelock Ellis references authors like Marc, Fonssagrives, and Perez.
What kind of work did the authors Marc, Fonssagrives, and Perez do?
These authors provide cases for children of both sexes who have masturbated from the age of three or four.
What else can you tell me about Havelock Ellis?
Havelock Ellis also contributed to the idea of varying levels of sexual excitation.

Question: What are those varying levels?
Self-contained rewrite: What are the varying levels of sexual excitation that Havelock Ellis described?