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,'.
What age approximately did he say that this impulse developed?
studies that found twenty percent of males and fourteen percent of females have pleasurable experiences with their sex organs before the age of six.
Who is more likely to experience it, males or females?
These authors provide cases for children of both sexes who have masturbated from the age of three or four.
Are all children able to experience pleasure?
twenty to twenty-nine percent of boys and forty-nine to fifty-one percent were masturbating by the age of eleven.
What did he conclude or find in his study?
Ellis concludes, then, that children are capable of a "wide range of genital and sexual aptitude..
Is there any other interesting facts you'd like to share?
He claims that the ability of some infants producing genital reactions, seen as "reflex signs of irritation" are typically not vividly remembered.
Did he reference any work in his studies?
He references authors like Marc, Fonssagrives, and Perez in France.

Question: What kind of work did those authors do?
Self-contained rewrite: What kind of work did authors Marc, Fonssagrives, and Perez do?