Azucena didn't participate for money or even for pleasure. She hates tickling and wouldn't be tickled even for thousands of dollars. She is a psychologist - a job like many others - but one that requires knowledge of the relationships between mind and body and also requires putting into practice the theoretical study learned at the University.
Azucena is a psychologist. For her, being tickled is a hard and difficult test; it is not fun at all, as you can see from the initial dialogues where she explains her very difficult relationship with tickling.
This is a personal challenge for Azucena. She was convinced that the power of her mind and concentration was enough to lose the terrible ticklishness of her body that had plagued her all her life. But she was wrong, and despite her exemplary willpower, she exploded into uncontrolled hysterical laughter.
She is ticklish from armpits to toes, and she will be tickled - without a safe word - from head to toes: