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Troilism describes sex between three individuals. The term was originally coined to describe the activity as a paraphilia.
Troilism is an alternative term to describe sexual intercourse involving three participants. Some believe that the difference between a threesome and troilism is that in a threesome there are no deliberate observers of the intercourse. In troilism, there is an observer. The term is thought to be a reference to Shakespeare's Troilus.