Nope. Throuple is dating, threesome is a one-time thing. Like if my wife and I have a girlfriend, we would be a throuple. And if we all sleep together, it would be a threesome. But saying “throuple=threesome” is like saying “couple=sex” when the two describe fundamentally different things. One is the relationship between people, and the other is just a physical act.

Nice condescending attitude though.