In Rio de Janeiro, Tatiane meets her boyfriend Marcelo on his birthday and he breaks with her, claiming that she is not romantic. The unbalanced Tati enters in the class of the biologist Conrado and hears his lesson about evolution, where he tells that modern women have destroyed years of evolution with their attitudes and lack of romanticism. Later, Tati meets Conrado on the street and she offers to work with him in his thesis. Conrado teaches Tati the correct behavior of a woman and how to seduce her mate. Meanwhile Marcelo feels jealous with Conrado that feels attracted by Tati and learns that his theory is not correct. The triangle of love is formed.