Key Difference – Affair vs Relationship An affair refers to a relationship that is mainly sexual. A relationship, on the other hand, refers to a connection that exists between two people. The key difference between an affair and a relationship is that while an affair is mainly sexual, a relationship is not.

Is kissing considered an affair?

Kissing Someone Else Isnt Considered Cheating, Even If Youre In A Relationship. Some people think its only cheating if you do something physical, while others consider emotional affairs a deal breaker. Some couples break up over it — others work it out.