Cindy and Donna plot
"A story of two sisters CINDY... so anxious to grow up. DONNA... who grew up too fast!"
Growing up in a suburban suburb with her 17-year-old half-sister Donna, sweet-natured and naive 15-year-old Cindy becomes timidly sexually aware. Both have the same mother, but they have different fathers. After Donna witnesses her father's sexual escapades and Cindy learns about it, Cindy freaks out. Cindy drops her sexual inhibitions and smokes marijuana with her friend Karen. Then both fulfill each other's sexual desires. Meanwhile, Donna takes a more advanced course of sexual awareness, gaining experience with three young peers.