14 and Under (1973)

Christine von Stratowa (13 at the time of filming) shows explicit full frontal nudity as she stands washing herself in a bath. Later a man comes in and begins washing her. The scene is not short and the nudity lasts for around 2 minutes. Well lit closeups of both her breasts and vulva are shown.

A girl of about 11 or 12 spies on her mother and her mother's boyfriend having sex. Full nudity of the mother. The young girl then masturbates (offscreen) and is caught by her mother, who exposes the girl's butt to her boyfriend so he can spank her. The young girl's bare butt is clearly visible throughout the scene as she struggles. There is at least one closeup, and glimpses between her legs as she is struggling.

Later, the young girl lifts up her nightgown to apply ointment on her exposed buttcheeks. Closeup.

Later still, the young girl's stepfather is seen stroking her bare butt as she is lying in his lap. They have sex offscreen.