Both Uses

lascivious
in
The Screwtape Letters
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There are some to whom "no passion is as serious as lust" and for whom an indecent story ceases to produce lasciviousness precisely in so far as it becomes funny: there are others in whom laughter and lust are excited at the same moment and by the same things.†
Chpt 11 *
Thus by inflaming the horror of the Same Old Thing we have recently made the Arts, for example, less dangerous to us than perhaps, they have ever been, "low-brow" and "high-brow" artists alike being now daily drawn into fresh, and still fresh, excesses of lasciviousness, unreason, cruelty, and pride.†
Chpt 25

Definitions:

(1) (lascivious)
expressing, showing, or provoking strong and typically inappropriate sexual desire
(2) (meaning too rare to warrant focus)