I have a big box of brightly colored dildos that I'm thinking of taking to the children's hospital.
I doubt the hospital wants those. What is the purpose of taking sex toys to a children's hospital?
I'm using the experience to write a book about my deepest desires.
Under no circumstances is bringing sex toys to a hospital full of children okay. Get into therapy and deal with your behaviour.
I'm being creative and using my experiences to create smut stories. This will be useful information.
I can't see how you can get useful information for a smut book from a children's hospital. They only thing this will accomplish is exposing children to adult items way too early. Find a different way to gather your information.