Conversation so far:
Did she write any books about sexual impulse?
goes into vivid detail of how children can experience sexuality differently in terms of time and intensity.
What was the name of the book?
Psychology of Sex.
What did he say in the book?
"If it is possible to maintain that the sex impulse has no normal existence in early life, then every manifestation of it at that period must be 'perverse,'.

Question: What age approximately did he say that this impulse developed?
Self-contained rewrite: What age approximately did Havelock Ellis say that sex impulse developed?