The young boy (Jonathan Chang, 8) is standing on a chair wearing nothing but a towel. As the boy stretches out to reach something, the towel falls off revealing his penis as he tries to grab the towel again.
Three boys are thrown from a teeter totter to a tree branch with one by holding the branch, the next boy holding his pants, and the next boy holding his pants pulling their pants down.
While the boy (12) is skinny-dipping with several of his friends, his sister throws their clothes into the water because they won't let her join them. Mostly rear, but some frontal nudity.