Boy and girl pee.

In a comedic scene a chubby boy runs naked into a room scarred and then embarrassed after realizing he is naked in front of a girl.

Girl hangs on feet of a boy (11). His trousers slide down.

Sakuzo and some boys swimming and playing in the lake wearing loincloth.

Hong Hai Er fighting with Avalokiteśvara.

Hong Hai Er fighting with Sun Wukong.

A scene from the movie Zero de Conduite (1933) where one boy (11) is wearing a night shirt and it flips over his back exposing his butt.

Rear nudity of Romeo in one scene.

Rear nuidty of a boy lying in bed. Many of the boys sleep in short nightshirts and when things get rambunctious these garments have a tedency to fly up, revealing bare bums beneath.

Boys seen rear nude when wearing hospital gowns.