This paper draws an analogy between the early modern definitions of clair-obscur and eighteenth-century libertine literature and libertinism. It is now relatively well acknowledged that libertine authors would rely on veils and linguistic shadows to make their texts more intriguing and all the more erotic. However, their direct references to the clair-obscur technique remain to be investigated. Libertine authors would often draw an analogy between their art, that of their fictional seducers or seductresses, and finally that of painters, through their respective skills in the art of clair-obscur. These authors' references to painterly techniques and to contemporaneous artistic debates can serve as further proof of the libertine desire to bridge the gap between the aesthetic and the erotic spheres. When they discuss the merits of shadows and lights, the libertine authors examined here reveal the union of erotic bliss and aesthetic delectation as the greatest source of jouissance. Clairs-obscurs are thus conceptualised, not only by artists but by libertines too, as crucial factors in one's quest for a superior form of enjoyment. Yet, departing from the painterly tradition and standing out from a century that praised both literal and metaphorical enlightenment, these libertines would make darkness the core and the source of their at once artistic and erotic pleasures.