On the other hand, when people live within environments that encompass little stress and threats to the viability of offspring, the need for serious and committed relations is lowered and therefore promiscuity and infidelity are more common.

According to this theory, when people live within environments that are demanding and stressful, the need for bi-parental care is greater for increasing the survival of offspring.

Correspondingly, monogamy and commitment are more commonplace.

The form and extent of these consequences are often dependent on the gender of the unfaithful person.

One measure of infidelity among couples is the frequency of children secretly conceived with a different partner, leading to "non-paternities".

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Article uses three citation styles: inline footnotes, a "references section" and a "further reading" section. For example, the first citation, Leeker & Carlozzi, points to the further reading section. Infidelity (synonyms include: cheating, adultery (when married), netorare (NTR), being unfaithful, or having an affair) is a violation of a couple's assumed or stated contract regarding emotional and/or sexual exclusivity.

A survey conducted in 1990 found 2.2% of married participants reported having more than one partner during the past year.

In general, national surveys conducted in the early 1990s reported that between 15-25% of married Americans reported having extramarital affairs.

When they are not met, research has found that psychological damage can occur, including feelings of rage and betrayal, lowering of sexual and personal confidence, and damage to self-image.