(NSFW) Do you think participating in a threesome is wrong? If not would you ever try it?

I’ve found with a lot of my relationships, guys would have the fantasy to “get it on” with two chicks. Personally, I could never see myself with two men either, especially now that I’m married. Is this mainly just a hype and people think they’d do it, but truly never would? Is this really something that should just be for single swingers? My husband and I are very open about what we want in the bedroom and he has hinted at this before. I’m having a hard time imagining how I’d react to us and another woman or man. If anyone has any personal experiences from this it would help me.