To fulfill his mother’s dying wish and avoid being removed from her will, an inflexible bachelor hires an actress to play his fiancée.
One car failure and a long bus ride to nowhere lead to a small Brazilian country town where two groups of guys and girls meet. This coincidences change the courses of their lives as they soon mingle and passion arises among them.
According to an Amazonian indigenous legend, a certain insect, Anophelis sexualis, has aphrodisiac properties: one who is bitten by it will surely die if it does not have sex within two hours. Knowing this news, Hans Muller, a scientist, moves to the habitat of the insect and collects several specimens for research in his laboratory in the city of Ilha Bela, on the coast of São Paulo. There, besides the local administration and the population, there are several tourists. By an accident, the insects flee and attack the world.
Bored with their marriage, the architect Marcelo proposes his wife Ana, a relation to three, with another sexual partner. The woman accepts, but the situation escapes from Marcelo's control because Ana engages lovingly with each other, and Marcelo no longer fits in the triangle proposed.
An industrial couple spends more than they can afford. In financial trouble, the husband Afraninho devises a strange kind of business, for foreign executives, in which the product is his own wife Malu. They succeed, and soon other couples start doing the same thing, establishing the competition.
Juliano is a millionaire who leads a boring life amidst the facilities that money provides him. One day, he decides to change his routine and associates with a mad scientist, Professor Kunz, who invents a magic potion, a drug that releases the other side of the personality of those who consume it. Juliano becomes a guinea pig and tries the potion, transforming into the beautiful Juliana (Vera Fischer). However, the effects of the new drug will cause many confusions between the millionaire and the crazy professor, creating complicated situations for both of them.