Visit to a Chief's Son (1974)

Kevin (12-13 years old) is briefly seen undressing before showering. Although he removes all of his clothes, he is positioned in the shadow and not much is shown.

Kevin skinny dips. This scenes is a few minutes long and shows explicit and up close nudity from the rear. His genitals are not shown, but the rest of his body is shown from the front and back, both on land and with underwater camera shots.