extra-marital affairs婚外情
extra-marital childbearing婚外生育
extra-marital relationship婚外关系
extra-marital relationships婚外关系
extra-marital lover婚外情人
extra-marital sexual relationship婚外性关系
And extra-marital affairs that different和婚外情的差异;和婚外情
extra-curricular extra-mural extra-marital以外的
ADJ（形容词） An extramarital affair is a sexual relationship between a married person and another person who is not their husband or wife. 通奸的 [usu ADJ n]
Her husband has admitted having an extramarital affair.
她丈夫承认了有通奸行为。