Ricciardo’s disbelief is based on a traditional understanding of Christian morality that says sex outside of marriage is sinful. Bartolomea rejects this worldview, and although
The Decameron operates in the context of a Christian society, it is not overly invested in traditional or legalistic morality; she is not punished for her sins but is instead rewarded with a satisfactory husband. The argument that men and women should enter sexually matched marriages, to avoid sins of the kind into which Bartolomea has fallen, recalls the reasons the Abbot in White gave for fleeing the marriage her father arranged for her and an elderly ally (II, 3). Bartolomea’s malapropism—mishearing “mortal” sin as “mortar” sin—allows Dioneo to insert a joke about sex. A mortar and pestle is a kitchen tool used to crush or grind substances; a “mortar” is a bowl and a “pestle” is a club-shaped object that fits inside it. The action of grinding ingredients recalls vulgar descriptions of the sex act.