Mixed Company (1974)

Features underage nudity (girls 7 and 10, and boy 13).

A white girl (7) walks into a bathroom in a bathrobe and asks a black kid (13), who is naked except for a towel around his waist, if he's "black all over." Then she takes off her bathrobe showing she is only wearing panties. She starts to pull down her panties, saying "I'm white all over and I don't care who sees it." But then her father enters and stops her.

A Vietnamese girl (10) takes off all her clothes in the dining room in front of several people and runs off. It shows her chest and butt.

An adult man gets angry at a young teen in the bathroom. The teen is naked except for a towel around his waist. The man pulls the towel off, revealing the teen's rear, and spanks him.