"第三者","外遇"英语口语表达

说"外遇",我们通常用的词是affair,指那些"短暂的,浪漫的风流韵事",说"和谁有外遇"就可以说成是"have an affair with someone".

She is having an affair with her boss. 她跟老板有暧昧关系.