Tomboy

I was expecting a story of a girl entering womanhood or discovering her sexuality. Instead the main character Jan is a tomboy who has no interest in sex but when her friend/neighbor makes a comment about her being inexperienced she responds by saying she did it with another guy which isn't true. So she asks him to pretend they are doing it to show up he neighbor they end up doing it for real.and Kay parker appears as the neighbor miss Robinson who comes on to Jan's brother.thry later meet again obviously to do it again but they don't show anything. Should have added a scene with them. Why have Kay parker if you don't make full use of her.