Donald was confused, his sister had a letter from school informing his mother that he had failed a subject. A subject from last semester in which he scored an 'A'.
Jill comes home to find her brother and her cousins having sex. When sneaking into her room she discovers their parent having swinging sex and acting out fantasies. She plans a birthday party for her dad where he takes her virginity thinking she is someone else.
Twins Jason and Julie are stuck at conservative, religious, same-sex boarding schools. They are so horny that they devise a plan to secretly switch places to satisfy their desires. A good time is had by all, but with both student bodies having only rumor to guide them instead of accurate sex education, there are complications.