彼は私通の罪で告発された。
He was charged with illicit intercourse.
かつては私通が発覚すると厳しく罰せられた。
In the past, an illicit affair was severely punished once it came to light.
その小説は、主人の妻と私通した若い使用人の物語だ。
The novel tells the story of a young servant who had an affair with his master's wife.