What's your opinion about a ménàge à trois?

I’m not talking specifically about sexual activity of three at the same time (threesome), and I’m DEFINITELY not talking about a love triangle. I’m talking about the SAME HOUSEHOLD. Anyway, feel free to share, though personally, if I were you, I’d not talk about whatever, let’s say, UNFAMILIAR experience of this sort you’ve had if you’re not 100% sure to.