Kanji 淫 lewdness, licentiousness 行 going, journey, carry out Related words 猥わい 褻せつ 猥褻 is a broader term for obscenity or indecency, often used in legal contexts regarding public morals, while 淫行 specifically refers to immoral sexual acts.
不ふ 倫りん 不倫 refers to adultery or an extramarital affair, whereas 淫行 is a more general term for lewd or obscene conduct, not limited to marital infidelity.
Etymology Compound of 淫 (いん , 'lewd, obscene') and 行 (こう , 'act, conduct'). The exact historical derivation is uncertain, but the term has been used in formal and legal contexts to denote immoral sexual behavior.
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