Nutty undresses for a shower (full nudity). A woman (apparently his nanny) observes as he's undressing, instructing that he is to wash every bit of himself very thoroughly, including his penis. Shortly after, the boy comes naked out of the bathroom, goes into his bedroom and fetches a small boat model to play with in the tub.
Jaime and his friend break into a club late at night to steal liquor, engage in horseplay, push each other into swimming pool. One of the boys (11) climbs out and strips naked to wring out wet clothes. Full frontal and rear nudity.
Nudist boy (Lucas Martín, 11) opens a door for two women. Less than two minutes later, one of the women walks over to converse with the boy. He is full frontal in both of those parts of the scene.
Two girls, approximately 9 and 10 y.o. invite a boy (11) to swim at the small private indoor pool. As they are giggling while stripping naked, the boy is doubting, whether he should do the same. Finally, he decides to join the girls, and all 3 of them have fun swimming.