The state or philosophy of having open, frequently casual, sexual experiences outside of committed relationships. This term is often seen as derogatory; "The Lifestyle" is currently preferred.
This is where two or more couples agree to get together for the express purpose of engaging in intimate, sexual activities with a partner or partners other than their own.
Social-sexual relational recreation among men and women. It is a couple oriented activity but single men and women sometimes are involved.
An exchange of partners, usually between two or more otherwise monogamous couples, which is generally structured to avoid the formation of emotional bonds.
consensual sex involving the exchange of marital partners for sexual purposes
Sex with a person or people other than one's partner that takes place with the consent, and usually the participation of, one's partner and may occur in private, or at a swing party or swing club.
Exchanging partners for sexual recreation.
Swinging, sometimes referred to in North America as the swinging lifestyle, is "non-monogamous sexual activity, treated much like any other social activity, that can be experienced as a couple."