“有外遇”英文怎么说？

Define 外遇: [ wài yù ]
1. extra-marital affair

Examples:
1. 你知道他有外遇了吗？？
Did you know he was having an affair?
2. 他采取双重标准: 自己可以有外遇, 女方却不行.
He's got a double standard: it's all right for him to have affairs but not for her.
3. 他真是自己骗自己--对妻子有外遇不闻不问.
He's such an ostrich he doesn't want to know about his wife's love affairs.
4. 她有了新的外遇情人.
She's taken a new lover.

have an affair,天上雪云间月答的对

Husband/Wife carries on with other woman/man.
carry on with是与。。。调情的意思

extramarital affair
ultra-marriage love
婚外恋

have an extra-marital affair
或者 have an affair