A much-planned two-family vacation to Rio begins with disaster as one husband, Victor (Joseph Bologna), deals with divorce papers while Matthew's (Michael Caine) wife decides to vacation alone somewhere else instead, leaving the two men on vacation with only their charming and adventurous teenage daughters. Confronted by so much bare young skin, confused about the state of his marriage, and swept up in the moment, Matthew lets Victor's daughter, Jennifer (Michelle Johnson), seduce him on the beach. But Jennifer's constant declarations of love and lust make keeping the affair from Victor difficult and twists Matthew into guilty knots. The surprise appearance of Matthew's wife (Valerie Harper, magnificent in a rage) reveals another hidden affair and unravels the romantic web crisscrossing between the families.