After her divorce, horny mom runs around teasing and tormenting her horny son as they spend the summer drifting down river in a house boat. Here, mom teaches her teenage son all about sex. They eventually meet a father and teenage daughter also drifting down the river and decided to make it a foursome for the rest of the summer.
Two brilliant, divorced, middle-aged sisters are desperate for sexual partners. They find a surprising solution for that problem. But in the process they develop an innovative program to benefit brilliant high school grads.