Answer: depict the moral complexities of characters.
One of the most striking characteristics of Boccaccio's tales is the fact that they deal with moral issues that were taboo at the time in a rich and complex manner. The characters of the stories are, for the most part, common people. However, they encounter big dilemmas that show their moral complexity. Boccaccio deals with this by being purposefully ambiguous when discussing moral matters. This ambiguity not only highlights the complexity and difficulty of the moral questions he presents, but also forces the reader to come to his own conclusions to these questions.