Medical term:

triolism


A paraphilia in which a man’s sexuoerotism hinges on watching his partner or wife having sex with another man
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.

triolism

(trī′ō-lĭzm)
Sexual activity involving two persons of one sex and one person of the opposite sex.
Medical Dictionary, © 2009 Farlex and Partners

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