Why People Have Affairs, and What It’s Really About

An affair is a secret romantic or sexual relationship between two people when one or both of them are in committed relationships to others.

The familiar explanation for an affair is that something must have been missing at home. One partner felt neglected, dissatisfied, or sexually frustrated, and went elsewhere to find what the relationship no longer provided. Sometimes that is true, but it is not the whole story.

People have affairs in unhappy relationships, but they also have them in relationships they describe as loving, stable, and sexually satisfying. Some are looking for another partner, others are looking for another version of themselves.

It is worth distinguishing explanation from excuse. Understanding why an affair occurred does not remove responsibility for deception or lessen the pain it caused. It simply gives us a more accurate starting point for deciding what happens next.

There is no single type of affair

The word “affair” covers a broad range of behavior. It may refer to an ongoing sexual relationship, a one-time encounter, an emotionally intimate connection, secret online exchanges, or some combination of these.

What makes the behavior a betrayal is not determined by a universal rule. It depends on the agreements within the relationship. In one couple, flirtatious messages may be acceptable. In another, they may represent a serious violation. The central issue is usually not sex alone, but secrecy and the breaking of a shared understanding.

Historically, infidelity has also been judged differently according to gender. Men’s affairs were often treated as regrettable but predictable, while women’s affairs were framed as evidence of moral or emotional failure. Neither stereotype tells us much about why an individual person crosses a relationship boundary.

The evidence suggests that affairs emerge from a mixture of personal, relational, and situational factors. Rarely does one explanation account for everything.

Sometimes it is about the relationship

Relationship dissatisfaction can certainly contribute to infidelity. A person may feel lonely, ignored, resentful, sexually disconnected, or unable to discuss an important need. An affair can become a place where that person feels heard, desired, or temporarily relieved from ongoing conflict.

But dissatisfaction does not automatically produce infidelity. Many people experience difficult periods in their relationships without having affairs. They talk, seek counseling, renegotiate the relationship, endure the discomfort, or leave.

The more useful question is not simply, “What was missing?” It is also, “Why did this person respond to what was missing through secrecy?”

That distinction matters. Otherwise, responsibility can quietly shift onto the betrayed partner: If they had been more affectionate, more sexually available, or less preoccupied, perhaps the affair would not have happened. Relationship problems may be shared. The decision to conceal another relationship is not.

Sometimes it is about feeling desired

Affairs frequently provide validation. Being wanted by someone new can temporarily relieve insecurities about age, attractiveness, competence, or sexual desirability.

In a long-term relationship, partners know each other in full. They have seen illness, financial stress, unwashed dishes, parenting failures, and ordinary fatigue. A new person encounters a more selective version. Attention can therefore feel unusually intense.

This does not mean the new connection is necessarily false. The feelings may be quite real. But they develop in an environment protected from much of everyday life. Novelty, secrecy, anticipation, and limited access can magnify attraction.

In practice, a person may believe they are pursuing someone extraordinary when they are also pursuing the experience of being seen without history.

Sometimes it is about becoming someone else

An affair can provide an escape from identity.

People may spend years being responsible: the dependable spouse, the attentive parent, the competent employee, the person who keeps everything functioning. A secret relationship creates a separate world in which they can feel spontaneous, reckless, powerful, sexually adventurous, or young again.

This helps explain why people sometimes have affairs even when they do not want to leave their partners. They may not be searching for a replacement relationship. They may be searching for access to a neglected part of themselves.

That part of the self does not necessarily have to be explored outside the relationship. Partners might experiment with a couples’ vibrator, a remote-controlled toy, or another unfamiliar form of stimulation as a way to introduce novelty and discuss desires that have gone unspoken. A toy cannot repair betrayal or resolve deeper dissatisfaction, but it can provide a practical starting point for consensual exploration.

Major life transitions can make this especially compelling. A milestone birthday, a health scare, the death of a parent, children leaving home, or a change in career can prompt uncomfortable questions: Who have I become? What possibilities have I lost? Is this the rest of my life?

An affair may appear to answer those questions. Usually, it only postpones them.

Opportunity matters more than popular stories admit

Not every affair begins with a profound unmet need. Sometimes access, proximity, alcohol, travel, digital communication, and weak boundaries create a situation that gradually becomes intimate.

Most affairs do not begin with a formal decision to betray a partner. They often develop through smaller permissions: sharing something unusually personal, hiding a conversation, deleting a message, extending time together, or deciding that a certain behavior “doesn’t really count.”

This gradual progression can allow a person to preserve a flattering view of themselves until the boundary has already been crossed. They may think of the affair as something that happened to them rather than a series of choices they made.

A more modest conclusion is that human behavior is shaped both by motivation and opportunity. Personal values matter, but so do the boundaries people maintain before temptation becomes emotionally rewarding.

What an affair means depends on what follows

After discovery, both partners often want a single explanation. The betrayed partner may ask, “Why wasn’t I enough?” The person who had the affair may say, “I don’t know.”

“I don’t know” may be honest, but it cannot remain the final answer if the couple hopes to repair the relationship. Recovery requires a more careful accounting of the choices, vulnerabilities, resentments, rationalizations, and opportunities that made secrecy possible.

Some couples end their relationship after an affair. Others rebuild. Neither outcome is inherently more mature. What matters is whether both people can make an informed choice based on truth rather than pressure, fear, or incomplete disclosure.

Rebuilding trust generally requires ending the outside relationship, accepting responsibility, answering reasonable questions, and establishing clearer boundaries. It also requires examining the relationship itself, but without treating its problems as retroactive permission for betrayal. A certified couples therapist can help when conversations repeatedly become destructive or reach an impasse.

Affairs are often described as being entirely about sex or entirely about an unhappy relationship. The record is less clear and more human. They may involve desire, loneliness, opportunity, avoidance, validation, resentment, identity, or the wish to interrupt an ordinary life.

Understanding those motives does not undo the injury. It does, however, replace a simple moral story with a more useful question: What truth was the affair trying (and failing) to address?

By Mark Schoen, Ph.D., AASECT-Certified Sexuality Educator

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