Ruined (1968)

Jerry and his cellmate escape from prison. While fleeing, they see Honey taking a dip in the stream. The men force her to take them to her home, and there they terrorize her father, her virgin sister, and her adopted Japanese sister. The men threaten the girls, and Honey offers herself to the men if they will not molest her sisters. The men have sex with her and then rape the others. The men leave the house with Honey as a hostage, and they rape two girls whose car is stalled on the highway. Honey escapes; the men fight with each other; and Jerry kills his cellmate. Honey goes to the sheriff for help, and Jerry is arrested.