the review state that this film be void of plot and acting and and merit be and for the most part and right on target . cindy and donna be nothing more than a soft core exercise so prevalent in the 70 with a pseudo story about two half sister sexually awaken certainly peak at different time a donna be have a relationship witness by cindy with cindy father ( i think . ) . the material be spartan when it come to plot development and really be just one sleazy scenario after another . there be essentially no acting in the movie except a rather mediocre performance come from susy allen a the harried and booze fill mother . her performance be at least interest if not definitely over the top . there be some weird moral the director and scriptwriter try to squeeze into all their soft core nudity scene and near incest scene and and masturbation scene and but i wasn not buy . this film above all be a lesson in tedium and how one must sometimes endure even the most try of film to get through to the end . cindy and donna be one of those film .