Dating back to ancient Greece, an orgy is a sex party where guests freely engage in open and unrestrained sexual activity or group sex with strangers and like minded people
In modern days, the common orgy takes place at swingers' parties, although, these don't always conform to the original definition of an Orgy, because at many Swinging Parties participants may all know each other, or at least have some commonality among them. Some swingers contend that an orgy, as opposed to a sex party, requires some anonymity of sexual partners in complete sexual freedom and abandonment.
Participation in an "orgy" is one of the most common sexual fantasies and group sex is often seen within pornographic films.
The term is also used metaphorically in expressions, such as an "orgy of colour" or an "orgy of destruction" to indicate excess, or overabundance. The term "orgiastic" doesn't always refer to group sex and is closer to more classical roots.
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