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.
Tati and Conrado go to Cancún, where he participates in a conference to launch his book. For her, the trip has an additional purpose: to ask him to marry her. During this very special moment, with family and friends watching via the internet, Conrado responds that he would like to think. Tati's disappointment turns into hope for her ex, Marcelo, who goes to meet her. Furthermore, Conrado's ex is also in Cancún, participating in the same event.
