lewdness, licentiousness
淫 centers on excessive, unrestrained indulgence, especially in sensual or sexual contexts: lewdness and licentiousness.
淫 combines 氵 (water) with 㸒, which likely contributes the sound and carries a sense of overflowing or excess. The idea is water spreading beyond its bounds, metaphorically applied to excessive desire.
Water 氵 overflowing its container suggests something spilling out of control. Picture a flood of unrestrained desire: lewdness and licentiousness.
For イン, imagine an inn where water overflows and guests indulge in lewd behavior: inn -> イン.
debauched; lewd; lascivious; lecherous; salacious; wild
lewd dream; salacious fantasy
prostitution
obscene; indecent; lewd; bawdy; loose; improper; dirty
indecent language; dirty talk
obscenity; harlotry
licentiousness
incubus; succubus; demon appearing in a dream
lustful beast; lascivious monster
adultery; fornication; illicit intercourse
masturbation; onanism
obscene; indecent; salacious; lascivious; lewd
arousing sexual desire
sexual desire; carnal desire; lust
obscenity; obscene
debauchery; dissipation; lewdness; lasciviousness
lewdness
prostitution; prostitute
lascivious woman; lewd woman
being romantically involved with someone of higher class (esp. of a man)