lubricity n.

late 15c., "lasciviousness," from French lubricité or directly from Medieval Latin lubricitatem (nominative lubricitas) "slipperiness," from Latin lubricus "slippery; easily moved, sliding, gliding;" figuratively "uncertain, hazardous, dangerous; seductive" (from suffixed form of PIE root *sleubh- "to slip, slide"). Sense of "oiliness, smoothness" in English is from 1540s; figurative sense of "shiftiness" is from 1610s.

The priests had excellent cause to forbid us lechery: this injunction, by reserving to them acquaintance with and absolution for these private sins, gave them an incredible ascendancy over women, and opened up to them a career of lubricity whose scope knew no limits. [Marquis de Sade, "Philosophy in the Bedroom"]