An affair is a sexual relationship, romantic friendship, or passionate attachment in which at least one of its participants has a formal or informal commitment to a third person who may neither agree to such relationship nor even be aware of it.
A romantic affair, also called an affair of the heart, may refer to a sexual liaison or more emotional relationship between two people who may have sex without expecting a more formal romantic relationship, an affair is by its nature romantic.
The term affair may also describe part of an agreement within an open marriage or open relationship, such as swinging, dating, or polyamory, in which some forms of sex with one's non-primary partner(s) are permitted and other forms are not. Participants in open relationships, including unmarried couples and polyamorous families, may consider sanctioned affairs the norm, but when a non-sanctioned affair occurs, it is described as infidelity and maybe experienced as adultery, or a betrayal both of trust and integrity, even though to most people it would not be considered illicit.
When romantic affairs lack both overt and covert sexual behavior, yet exhibit intense or enduring emotional intimacy, it may also be referred to as an emotional affair, platonic love, or a romantic friendship.
InfidelityLegitimacy (family law)Adultery and Extramarital sex
Extramarital affairs are relationships outside of marriage where an illicit romantic or sexual relationship or a romantic friendship or passionate attachment occurs.
An affair can continue in one form or another for years, even as one of the partners in that affair passes through marriage, divorce, and remarriage. This could be considered the primary relationship, with the marriage secondary to it. Several people claim the reason for an extramarital affair is their unsuccessful marriage where both spouses fail to please each other. This may be serial polygamy or other forms of nonmonogamy.
The ability to pursue serial and clandestine extramarital affairs while safeguarding other secrets and conflict of interest inherent in the practice, requires skill in deception and duplicitous negotiation.