University of Minnesota

Extradyadic romantic activity (ERA) includes sexual or emotional interaction with someone other than a primary romantic partner. Given that most romantic couples aim to have sexually exclusive relationships, ERA is commonly referred to as cheating or infidelity and viewed as destructive and wrong. Despite this common sentiment, ERA is not a rare occurrence. Comparing data from more than fifty research studies shows that about 30 percent of people report that they have cheated on a romantic partner, and there is good reason to assume that the actual number is higher than that.
Although views of what is considered “cheating” vary among cultures and individual couples, sexual activity outside a primary partnership equates to cheating for most. Emotional infidelity is more of a gray area. While some individuals who are secure in their commitment to their partner may not be bothered by their partner’s occasional flirting, others consider a double-glance by a partner at another attractive person a violation of the trust in the relationship.

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