( a )When a person married another person when the first marriage is subsisting then it is adultery and not named as second marriage. It also amounts to bigamy. In such case the life of the spouse is fixed as adulteress life and court will grant divorce.
(b ) When a person is living together relationship with any other person other than his/her spouse amounts to adultery. Not a single act of sexual inter-course outside marriage is adultery but living as an husband and wife relationship with others when a marriage is still subsisting amounts to adultery. Single night stand is not amounts to adultery.