triolism:

Or: troilism :

1. Sexual behavior involving three people regardless of gender (two men and one woman , three men, two women and one man , or three women) also known, colloquially, as: club-sandwich ; cluster fuck ; double-peptide ; flesh-sandwich ; ménage à trois; Peter, Paul and Mary; Oreo-cookie ; sandwich ; sausage-sandwich ; séance-à-trois ; three-decker ; three-high ; three-hole-activities ; three-in-a-bed : three-layer-cake ; Three-P ; threesies ; three-way ; three-way-split ; three-way-swing ; threesome ; triple-shag .

2. In psychiatry, triadic group-sex in which a wo/man engages in sexual-relations with a partner and then watches while s/he engages in sexual activities with a third party .

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