Swinging, often called the 'lifestyle', is a sexual activity involving non-monogamous (usually married) partners, and can include the following activities:
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- Two couples sharing partners
- One couple and an additional person to form a threesome
- Group sex - a group of people, not necessarily comprised only of couples. Typically group sex is a somewhat private affair, participants must ask to be included, or be invited in.
- Orgy - group play where people can simply join in if they want (proper etiquette always applies).