Are children likely to be shocked by their first sight of naturists?
No. Children take to nudity like ducks to water. Cases of children being upset by the sight of nude people are extremely rare. As people grow up, they are taught by social convention that nudity is wrong or shocking. You are not born with an aversion to human bodies: before the Victorian period society was far more tolerant of the bare body and we seem to be moving steadily back in that direction. There’s nothing inherently wrong with nudity.