Extramarital sex
Extramarital sex is sexual activity in which at least one sex partner is a married person and the partners are not married to each other. The term may be distinguished from premarital sex where neither partner is married.
Where extramarital sex does not breach a sexual norm, it may be referred to as consensual non-monogamy (see also polyamory). Where extramarital sex does breach a sexual norm, it may be referred to as adultery or non-monogamy (sexual acts between a married person and a person other than the legal spouse), fornication, bigamy, philandering, or infidelity. These varying terms imply both immoral or religious consequences, charged whether via civil law or religious law.