In a flashback secene we see 8 year old Hermann dancing and stripping in front of his friends and parents and running out the house naked and dancing on the street.
In a surreal fantasy/musical like segment (about 7 mins long) eight naked boys from 5 to 13 appear "dressed up" as cupids (curly wigs, wings, bows and arrows). Full frontal and rear nudity, as the cupids shoot arrows, serve food and drink and dance.
At the end of the movie, the possessed uncle forces Peter to strip and dance in front of his mother and sister. This includes a full frontal shot when he is made to throw his clothes out of the door.
Two slightly chubby boys aged 10 and 13 are told by their mother that they can't wear their swimsuits at dinner so they take them off and dance around, showing everything.
2 boys (both about 5) and 2 girls (approximately 5 and 7) are jumping up and down completely nude in a trough outdoors. When a band starts playing, they climb out of the trough and dance around nude in a circle.