There is nothing more complicated than the relationship between a man and a woman. But there is also nothing more beautiful, sweeter and more fruitful. Psychologist Beth Johnson will have to verify this. Beth, a lonely, unlucky woman, goes to a lovers' club for a weekend to conduct scientific research. Only “couples” are allowed there, and Beth persuades her friend Tom to join her. Of course, her theoretical research is very quickly supported by practice. And which! The result of this “scientific research” exceeds all her conceivable and unimaginable expectations...