Definitions, no waffle
Affair: At least one person is in a committed relationship, and their partner doesn't know. Can last weeks or years.
Fling: Short, intense, light. Often ends naturally, and can involve single people.
Casual relationship: Ongoing, regular, openly non-exclusive. Everyone's aware.
Situationship: Undefined, and often one person wants more than the other.
Ethical non-monogamy: Open to others, with the knowledge and agreement of all involved.
Why it matters
The label tells you what to expect. Mixed-up labels cause most of the heartache: one person thinks fling, the other thinks future.
How to check you're on the same page
Ask early: "What are you looking for? What are you not looking for? Who knows about this?" Direct questions are sexy, not awkward.
FAQs
Is a one-night stand an affair?
If one person is in a committed relationship and their partner doesn't know, many would say yes.
What's the difference between an affair and open relationships?
Consent. In open relationships, everyone knows.
Can a fling turn into more?
Sometimes, but plan for it not to.