The All-American Girl (1973)

Debbie, a high school girl is on a mission to discover life's erotic pleasures. She promises her mom she wouldn't "go all the way," but that doesn't include experimentation. Because her boyfriend Bobby leaves for Guatemala for three months and she is expecting a boring summer. But then she discovers her neighbors and their 15-year old son Johnny, then entices each of them one by one. the local bookworm, teases an older man, has a liaison with the bookworm's mother and finds self-love.