Naturist clubs are often regarded, by outsiders, as a hotbed of swinging.
Many people actually have been at the sharp end of child sex abuse from a fully clothed adult, often from a person in a trusted position, such as a family member or religious zealot.
Many naturist/nudist/naktiv people actually manage to come to terms with this experience, to in some way deal with the emotional trauma, by expressing themselves as naturists or naked activists in some manner.
I hold up my hand here as someone who was abused by different adult males at different times when I was a child.