Technically, three people together for any purpose, but most commonly used for three people having sex. Also a fairly good movie about the relationship between one woman and two men accidentally assigned to share a college dorm suite.

a fairly effective method of dismantling the emotional aspect of a couple's relationship. used initially by a participant of a relationship under the pretense of expanding and diversifying the couple's sex life (which usually proves positive in an relationship, overall), though the true intent (concious or subconcious) or if not, final result, is to terminate the relationship indirectly.

"You know what I'd really like, baby?"

"What's that?"

"A threesome."

"A threesome? Hmmmm.... Okay let's do it!! We'll have to find another girl...."

"Two other girls, actually."

"Two? But that would be a foursome."

"No, me and these two girls. You wouldn't be involved."

"Huh? What the fuck are you talking about?"

"You don't understand baby, I'm so crazy about you that I'd totally end up ignoring the other girl. Wouldn't be fair to her."

"Really."

"You could watch, maybe."

"....I see."

"But you'd have to watch from the closet, I'd be weirded out if you were just sitting there."

"Seriously? Okay, fine, whatever. I guess I could do that."

"Or you don't have to watch at all, you could just go shopping."

"Sheesh. Fine. Fine. You go find your two other girls and have your threesome and I'll go shopping.... So when do you want to do this?"

"Last Tuesday. .... Baby, wait, where ya going?"

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