It depends on the person. Its usually a bad idea but some people do live like this and are happy. If you are not into men your with would be the one with 2 husbands and you guys woud be Sister-husbands hahaha Are you ok with your wife having another reationship? Hearing them having sex without you? It will happen. Are you ok with them having inside jokes that don’t include you?

Not being mean but there is no 3 way relationship. A throuple is 3 relationships that work well independently.

Are you ok with that?! If yes let them fuck. If not well…