True. Such material falls under child sexual abuse imagery and is prohibited by law. In practice, the justice system focuses primarily on harmful situations, such as blackmail or images being forwarded or shared without consent. Deepfakes also fall under this category.
If two young people of roughly the same age voluntarily take or exchange nude photos of each other, this is still illegal under the law. In most cases, this does not lead to punishment or further measures if it remains consensual. However, the moment an image is shared or distributed, prosecution may follow.
Tip! Teach your child never to forward such images. Not even as a joke!