In a typical "green-apple-moment", we see 12 yo boy play with a sprinkler, then removing his trunks to dry them a bit, and teasing his parents who have just stopped making love.
Full nudity of a girl (10) undressing and skinny dipping during a picnic. Brief frontal nudity of a boy (10) who wants to join her and starts pulling his shorts down, but he's called back by his mother.