Peter und Sabine (1968)

Three brothers and their sexual problems. Jens, 20 y.o., becomes divorcée Claudia's lover. Jan, 13 y.o., loves Lilo who loves Jacques. Peter, 16 y.o., dates Sabine against her mother's will, who sends Sabine to another school. Peter then becomes involved with another girl, who seduces and abandons him. He then has an affair with waitress Gitte, who tries to squeeze money out of Peter, pretending she's expecting their baby. Jacques manages the situation, so that Peter, now wiser about the facts of life, can fight for Sabine again.