Tati likes Marcelo who likes to date many girls. Sincere (at times even too sincere), Tati demonstrates her love, but ends up only pushing Marcelo away. After listening to a lecture by the young biology professor, Conrado, she has an idea: apply his polemic theories to her relationship. Conrado develops a technical seduction guide based on Charles Darwin?s theory, comparing the behavior of young lovers to that of animals. The beautiful guinea pig is working hard and everything seems to be going well in reconquering Marcelo. The scientific experiment becomes more complicated when romance appears in the air between the professor and student.