In "Moonlight Sins" by Jennifer L. Armentrout, there is a poignant belief that runs through the lineage of the de Vincent family. Their great-great-grandmother left behind a legacy stating that the men in their family experience love in an intense and immediate manner, often devoid of logic or doubt. This idea reflects the passionate and sometimes tumultuous nature of their romantic relationships.

This concept shapes how the characters navigate their feelings and relationships throughout the story. It introduces a sense of urgency and inevitability in their love lives, suggesting that when a de Vincent man falls in love, it is an all-consuming, whirlwind experience that cannot be ignored. This theme of fervent love becomes a cornerstone of the narrative, influencing decisions and dynamics among the characters.